钛合金WSS图中的应力应变循环

Stress-strain cycles of titanium alloy welding process

焊接热弹塑性应力应变过程全图从宏观上描画了焊接热弹塑性应力应变过程,全图中每一区域内应力应变关系是该图的重要组成部分。取钛合金薄板上距焊缝中心不同距离的点来定量分析各自的焊接热弹塑性应力应变关系,以此给出焊接过程中任一时刻试件上某一点的应力应变状态。在此基础上,给出焊接热弹塑性应力应变过程全图任一区域中点的应力应变关系,定量描述该图,使得对全图的理解更加完整。结果表明,钛合金焊接热弹塑性应力应变过程全图中各区域的纵向应力应变循环曲线不同,在冷却过程中钛合金焊缝和近缝区处于卸载状态。

The welding thermal elasto-plastic stress-strain cycles diagram (shortly WSS diagram) describes the welding stress-strain relation on the whole. The stress-strain cycle in every area is the necessary part of the WSS diagram. The stress and strain relations of the points with different distances from the weld centerline on the specimen were investigated. The states of stress and strain of some point on the specimen during the welding process could be derived. On the basis of these results, the stress and strain relation in the each area of WSS diagram can be derived, and the diagram is described quantitatively, which make it easy to understand the WSS diagram. The results showed that the longitudinal stress-strain cycles are different in the different areas in the diagram. During the cooling process, weld and the zone nearby are in the unloaded states.