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9732973 Fatigue strength of spot-welded joints of aluminium alloy sheets with solidification cracking nugget and its improvement
Abstracts /JSAE Review 19 (1998) 89 109 the scale model during right-angled side collision. The result agreed with that of the actual car very well. The safety condition of the occupant in the struck car at the side collision was investigated in this study.
9732919 Estimation of the Impact Angle from Traces on Windshield at a Vehicle-to-Vehicle Accident Hiroki Yamamoto (National Research Institute of Police Science) This report describes a method of quantitative estimation of impact angle from the traces impressed on the windshield by an occupant of a vehicle to vehicle accident. First we show the equations which give the relation between the impact angle and the movement of occupant at the collision. Then the impact angle is estimated by solving the above equations using the measured traces of movement of the occupant. The accuracy of the estimated impact angle was verified by an experiment using an actual car and a dummmy. 9732928 Evaluation Method of Optimum Characteristics in Frame Structures Noriaki Yoshida (Hokkaido Institute of Technology) The evaluation and verification of a solution for the optimum structural design problem is the theme of this study. The structural design problem is formulated by the mathematical programming problem, and the Kuhn-Tucker conditions are used to evaluate the solutions. The method of inscribed hypershere is applied to formulating the problems, which may be able to predict a set of active constraints at the optimum in the early design stage where the constraints are not yet critical, but the optimum characteristics might be obtained. The optimum characteristlics are inspected with the distribution of the sizing variables of a cantilever beam and a lattice flame in statics. 9732937 Evaluation for Stiffness of Passenger Car Body Taiki Nomoto, Masato Kamimura, Daichi Okamoto (Graduate School of Keio University), Kunihiro Takahashi (Keio University) It is important to obtain the information of load transfer in body structures. A parameter E* denoting the strength of connection between a loading point and an arbitrary point in the structure is introduced. Using the parameter E*, we can not only define the load transfer course but also propose the conditions for desirable structures. The proposed three conditions can automatically introduce a high stiffness body, although the conditions have no direct intention to realize the higher stiffness. A simple model is calculated with FEM to confirm the emergence of the satisfactory structure using the above conditions. The load transfer course in an actual sedan body is obtained experimentally. Test results show the desirable conditions are almost satisfied, and each member of the body is estimated with these conditions. 9732946 Mechanical Dynamics Simulation using Linear Flexible Property of Vehicle Body Kenji Yamazaki (ESTECH Corp.), Hiroshi Mimura, Yoshiro Ohtsu (Nissan Motor Co., Ltd.) A vehicle dynamics, including handling characteristics, is studied by driving test and evaluated qualitatively in the current design process. The quantitative evaluation is particularly difficult, not only in testing but also in simulation. In this paper, a new approach is presented in which a vehicle body of linear flexibility derived from a large finite element model is introduced into mechanical dynamics simulation and its vehicle dynamics characteristics are studied quantitatively. 9732955 Dynamic Stress Analysis of Fuel Tank Considering Car-Body Stiffness etc. Toshihide Hatanaka, Jun Yoshida (Daihatsu Motor Co., Ltd.) In most cases of predicting the stress of a car-body or components in rough road running test, it is necessary to consider the dynamic behavior. This paper presents a method to simulate the behavior of a fuel tank, one of such components considering the fuel fluid by the virtual mass method, and to predict the dynamic stress of the fuel tank with the car-body. By using this method, it is possible to study the effect of the body stiffness on the dynamic stress distribution of a fuel tank.
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9732964 Stress Analysis of Spot-Welded or Weld-bonded Circular Plates Subjected to Torsional Load Sachiko gujita (Nihon University Graduate School), Akio Asano, Ryoichi Sato (Nihon University) Stresses in the spot-welded or weld-bonded circular plates subjected to torsional loads were calculated analytically. Models for analysis have such a nugget at the center of the plates that is surrounded by bonded area at its circumference. The influences of bonded area, Young's modulus and thickness of the adhesive on the stress distributions were investigated analytically. The analytical results were consistent with the results of FEM. 9732973 Fatigue Strength of Spot-welded Joints of Aluminium Alloy Sheets with Solidification Cracking Nugget and Its Improvement Jun Takagi, Nobuyuki Mori, Masao Fujimoto (Toyota Central R&D Labs, Inc.) Solidification cracking accurs occasionally in the spot-welded part of aluminum alloy sheet joints. A box section beam constructed by spotwelds fractured from such solidification cracking parts in the flange under cyclic bending load. It was found that the fatigue strength of the box section beam was the same as that of a spot-welded double sheets specimen under cyclic tensile load. When the solidification cracking was reduced under optimized welding conditions, the fatigue strength was improved significantly. 9732982 Study of the Energy Absorbance Characteristics of Steel and Aluminum Structural Members Tetsuo Yamashita (Musashi Inst. of Tech), Yukio Yoshida, Yuichi Onuki (Kanto Auto Works, Ltd.), Toshiyuki Hosogawa (Furukawa Electric Co., Ltd.) The reinforcement techniques for members composed of the presently selected steel sheets are studied based on extruded aluminum materials. This paper reports on the study conducted by means of experiments on the hat section material disruptive mechanism, as well as FEM and other analytical tools. It was shown that the hat section materials, when reinforced by extruded aluminum materials, improve energy absorbance characteristics. 9732991 Optimum Design of Frame Column Subjected to Axial Crushing by Statistical Design Support System Takayoshi Kashiwamura (NHK Spring Co., Ltd./Yokohama National University), Takao Mori (Toyama Prefectural University), Masaki Shiratori, Qiang Yu (Yokohama National University), Osamu Maruyama (Yokohama National University) The authors proposed a new practical design support system that consists of five steps: the affectivity analysis, reanalysis, evaluation of dispersion, optimization and evaluation of structural reliability. In this study, the authors applied the present system to analysis and optimum design of a frame column subjected to axial crushing. This study deals with many complex behavior patterns such as large deformation, contact and material nonlinearities as well as impact behavior. However, this problem was solved easily using the present system, and satisfactory results of the affectivity analysis, optimum design and so on were obtained. 9733008 Promotion Plan of the Development of Advanced Safety Vehicle (ASV) Takuro Miyazaki, Tetsufumi Mikami (Road Transport Bureau, Ministry of Transport) The Ministry of Transport has established the "Advanced Safety Vehicle (ASV) Promotion/Investigation Group" consisting of several manufacturers and university professors, and has conducted research & development of ASVs equipped with numerous driver-friendly devices, to ensure high-level safety by applying advanced electronics technology. 9733017 Approach to Safety through Vehicle Dynamics Control System Akihiro Maeda, Koichi Morikawa, Tetsuro Arikawa (Nippon ABS Ltd.)
9732919 Estimation of the Impact Angle from Traces on Windshield at a Vehicle-to-Vehicle Accident Hiroki Yamamoto (National Research Institute of Police Science) This report describes a method of quantitative estimation of impact angle from the traces impressed on the windshield by an occupant of a vehicle to vehicle accident. First we show the equations which give the relation between the impact angle and the movement of occupant at the collision. Then the impact angle is estimated by solving the above equations using the measured traces of movement of the occupant. The accuracy of the estimated impact angle was verified by an experiment using an actual car and a dummmy. 9732928 Evaluation Method of Optimum Characteristics in Frame Structures Noriaki Yoshida (Hokkaido Institute of Technology) The evaluation and verification of a solution for the optimum structural design problem is the theme of this study. The structural design problem is formulated by the mathematical programming problem, and the Kuhn-Tucker conditions are used to evaluate the solutions. The method of inscribed hypershere is applied to formulating the problems, which may be able to predict a set of active constraints at the optimum in the early design stage where the constraints are not yet critical, but the optimum characteristics might be obtained. The optimum characteristlics are inspected with the distribution of the sizing variables of a cantilever beam and a lattice flame in statics. 9732937 Evaluation for Stiffness of Passenger Car Body Taiki Nomoto, Masato Kamimura, Daichi Okamoto (Graduate School of Keio University), Kunihiro Takahashi (Keio University) It is important to obtain the information of load transfer in body structures. A parameter E* denoting the strength of connection between a loading point and an arbitrary point in the structure is introduced. Using the parameter E*, we can not only define the load transfer course but also propose the conditions for desirable structures. The proposed three conditions can automatically introduce a high stiffness body, although the conditions have no direct intention to realize the higher stiffness. A simple model is calculated with FEM to confirm the emergence of the satisfactory structure using the above conditions. The load transfer course in an actual sedan body is obtained experimentally. Test results show the desirable conditions are almost satisfied, and each member of the body is estimated with these conditions. 9732946 Mechanical Dynamics Simulation using Linear Flexible Property of Vehicle Body Kenji Yamazaki (ESTECH Corp.), Hiroshi Mimura, Yoshiro Ohtsu (Nissan Motor Co., Ltd.) A vehicle dynamics, including handling characteristics, is studied by driving test and evaluated qualitatively in the current design process. The quantitative evaluation is particularly difficult, not only in testing but also in simulation. In this paper, a new approach is presented in which a vehicle body of linear flexibility derived from a large finite element model is introduced into mechanical dynamics simulation and its vehicle dynamics characteristics are studied quantitatively. 9732955 Dynamic Stress Analysis of Fuel Tank Considering Car-Body Stiffness etc. Toshihide Hatanaka, Jun Yoshida (Daihatsu Motor Co., Ltd.) In most cases of predicting the stress of a car-body or components in rough road running test, it is necessary to consider the dynamic behavior. This paper presents a method to simulate the behavior of a fuel tank, one of such components considering the fuel fluid by the virtual mass method, and to predict the dynamic stress of the fuel tank with the car-body. By using this method, it is possible to study the effect of the body stiffness on the dynamic stress distribution of a fuel tank.
105
9732964 Stress Analysis of Spot-Welded or Weld-bonded Circular Plates Subjected to Torsional Load Sachiko gujita (Nihon University Graduate School), Akio Asano, Ryoichi Sato (Nihon University) Stresses in the spot-welded or weld-bonded circular plates subjected to torsional loads were calculated analytically. Models for analysis have such a nugget at the center of the plates that is surrounded by bonded area at its circumference. The influences of bonded area, Young's modulus and thickness of the adhesive on the stress distributions were investigated analytically. The analytical results were consistent with the results of FEM. 9732973 Fatigue Strength of Spot-welded Joints of Aluminium Alloy Sheets with Solidification Cracking Nugget and Its Improvement Jun Takagi, Nobuyuki Mori, Masao Fujimoto (Toyota Central R&D Labs, Inc.) Solidification cracking accurs occasionally in the spot-welded part of aluminum alloy sheet joints. A box section beam constructed by spotwelds fractured from such solidification cracking parts in the flange under cyclic bending load. It was found that the fatigue strength of the box section beam was the same as that of a spot-welded double sheets specimen under cyclic tensile load. When the solidification cracking was reduced under optimized welding conditions, the fatigue strength was improved significantly. 9732982 Study of the Energy Absorbance Characteristics of Steel and Aluminum Structural Members Tetsuo Yamashita (Musashi Inst. of Tech), Yukio Yoshida, Yuichi Onuki (Kanto Auto Works, Ltd.), Toshiyuki Hosogawa (Furukawa Electric Co., Ltd.) The reinforcement techniques for members composed of the presently selected steel sheets are studied based on extruded aluminum materials. This paper reports on the study conducted by means of experiments on the hat section material disruptive mechanism, as well as FEM and other analytical tools. It was shown that the hat section materials, when reinforced by extruded aluminum materials, improve energy absorbance characteristics. 9732991 Optimum Design of Frame Column Subjected to Axial Crushing by Statistical Design Support System Takayoshi Kashiwamura (NHK Spring Co., Ltd./Yokohama National University), Takao Mori (Toyama Prefectural University), Masaki Shiratori, Qiang Yu (Yokohama National University), Osamu Maruyama (Yokohama National University) The authors proposed a new practical design support system that consists of five steps: the affectivity analysis, reanalysis, evaluation of dispersion, optimization and evaluation of structural reliability. In this study, the authors applied the present system to analysis and optimum design of a frame column subjected to axial crushing. This study deals with many complex behavior patterns such as large deformation, contact and material nonlinearities as well as impact behavior. However, this problem was solved easily using the present system, and satisfactory results of the affectivity analysis, optimum design and so on were obtained. 9733008 Promotion Plan of the Development of Advanced Safety Vehicle (ASV) Takuro Miyazaki, Tetsufumi Mikami (Road Transport Bureau, Ministry of Transport) The Ministry of Transport has established the "Advanced Safety Vehicle (ASV) Promotion/Investigation Group" consisting of several manufacturers and university professors, and has conducted research & development of ASVs equipped with numerous driver-friendly devices, to ensure high-level safety by applying advanced electronics technology. 9733017 Approach to Safety through Vehicle Dynamics Control System Akihiro Maeda, Koichi Morikawa, Tetsuro Arikawa (Nippon ABS Ltd.)