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Weight-reduction
Design of Auto Structures
Based
on Strength Features
ZHENG Songlin1 WANG Yansheng2 LU Xi1 CHU Chaomei1
(1. College of Mechanical Engineering,
University of Shanghai for Science and Technology, Shanghai 200093;
2. Department of Engineering Mechanics, Henan University of
Science and Technology, Luoyang 471039)
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Abstract: A weight-reduction design method
is presented, which can make auto components and parts with finite life.
The method is technically based on the strengthening and degenerating
properties of the structure strength meanwhile combining dynamic
strength equation (i.e., calculating model) with strength test results
of auto parts. In order to realize the given critical load or the design
goal, finite element method is used in getting a rational increase of
design stress. As an application of this method, a truck front axle was
redesigned. By designing the critical section and reducing the
figuration dimensions, a lower critical load of the front axle is obtained. Consequently the test stress is increased to an area of causing the strength of axle not to be strengthened under repeated stresses. As a result, the mass of front axle was reduced with 5.5 kg. The new axles were verified to fulfill the strength standards on test rig, and no obvious change was observed for static strengths after fatigue tests. The tests results show that the strength potential of components and parts of automobile could be exerted more fully than that designed with the method of using finite element analysis
adding to the allowed stress, which can only make the design of infinite
life for auto parts. The light weight design for components and parts of automobiles can be realized in a deeper extent with this new method. This new method is of important science value and guidance meaning for now a day’s development in auto light weighting. engineering value in many industrial fields other than in auto industry.
Key words: Auto structures Weight-reduction design Strength features Finite life
CLC No:
TH123.3 U463.31
国家自然科学基金(50375101)和上海汽车工业科技发展基金(0329)资助项目.
Received
20070311,
received
in
revised
form
20071016
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