李红斌
,
田伟
,
郑明月
,
徐树成
机械工程材料
采用Gleeble3500型热模拟试验机,通过高速等温压缩试验所得的流变应力曲线以及温度变化曲线构建了传统热变形本构方程和考虑温度弹跳的热变形本构方程,并将它们与实测值进行对比,研究了普碳钢在热压缩变形过程中的温度弹跳以及其对构建本构方程精确度的影响.结果表明:在高速压缩过程中,由塑性功导致的温度弹跳使温度已严重偏离设定值,由塑性功转化热造成的温升与真应变呈线性关系,线性系数与设定的变形温度有关;构建的考虑温度弹跳的热变形本构方程比传统热变形本构方程的预测精度更高.
关键词:
热变形本构方程
,
压缩试验
,
塑性功转化热
,
温度弹跳
C.P. Chou
,
S.C. Wang
,
C.C. Chang and W.R. Wang 1) Department of Mechanical Engineering
,
National Chiao Tung University Hsinchu
,
Taiwan 300
,
China 2) Materials Research Laboratories
,
Industrial Technology Research Institute Chutung
,
Taiwan 310
,
China
金属学报(英文版)
Titanium has been widely used as the implant materials of joint prostheses. This paper simulates the microstructures of the hot forged titanium knee joint component by physical modeling. Ti-6Al-4V ELI were deformed by GLEEBLE 2000 hot deforma- tion simulator in compression mode to determine the hot workability, in the range of 900 to 1100℃, with the strain rates between 0.05 to 5 s~(-1). Test results derived from specimens processed by on-cooling test and on-heating test were compared, thereby estimating the effect due to thermal history. The forging process of Ti-6Al-4V ELI tibial base plate of knee joint prostheses was design based on the workability data obtained.
关键词:
physical modeling
,
null
,
null
,
null
,
null
张明星
玻璃钢/复合材料
通过对机翼上壁板半圆切单接头长桁端头试验件进行轴向压缩测试,测得了整个试验件的载荷-应变曲线.试验结果表明,破坏主要集中在接头与长桁缘条连接区域第一排螺钉所对应的复合材料结构压溃断裂,与接头相连的长桁缘条发生长纤维断裂.建立了相应的有限元模型,因为有限元计算中未考虑损伤及刚度衰减,导致有限元分析结果比实际的试验结果略高.
关键词:
上壁板
,
压缩测试
,
应变
,
破坏
,
有限元分析
