A force-based failure criterion for spot weld design |
| |
Authors: | P Wung |
| |
Institution: | (1) Ford Motor Company, MD44 AEC Building, 48121 Dearborn, MI |
| |
Abstract: | This paper suggests a very simple, force-based formula that combines four failure modes into one dimensionless equation to
govern spot weld failure under general static loading conditions. The four failure modes are shear, rotation, normal and peel.
The normal separation mode and the peel mode are corresponding to mode I (opening mode). The tensile/shear mode is mode II
(sliding mode), and the in-plane rotation mode is mode III (tearing mode). Test coupons and test fixtures are designed and
tested to establish and verify this equation. To further verify this equation, a long difficult to understand automotive spot
weld failure problem was studied. Applying finite element-calculated resultant loads to the proposed formula resulted in analytical
values that correlated very well with the long time field observed spot weld failures. This analytical prediction reasonably
explained the spot weld failure mechanism and provided good design directions to improve the durability of the auto structure. |
| |
Keywords: | Spot weld complete failure modes forcebased failure criterion semi-empirical method test coupon for verification |
本文献已被 SpringerLink 等数据库收录! |
|