【摘要】 通过建立拉伸试验理论模型,导出了横梁位移速率的一般性表示式。在线弹性变形阶段,根据这一表示式,可以得到应变速率是试验机系统刚度的准确函数关系;而在屈服的塑性变形阶段,根据这一表示式,通过理论分析和做合理的近似性处理,得到应变速率是试验机系统刚度的近似准确函数关系。实质上GB/T 228.1-2010附录F中的公式(F.1)和公式(F.2)包含了上述性质,即该两公式用于线弹性变形阶段,是准确的公式,而用于屈服的塑性变形阶段是近似准确的公式,理论上近似准确的公式不是理论上错误的公式。更多还原

【Abstract】 The general equation for crosshead separation rate was derived through the tensile testing theoretical model built in this paper.In the linear elastic deformation phase,the exact function relation between the strain rate and testing machine system stiffness could be got through the general equation.And in the yield plastic deformation phase,the approximate accurate function relation between the strain rate and testing machine system stiffness could be got through theoretical analysis and reasonably approximate treatment according to the general equation.It is exact for equation F.1and F.2in Annex F of GB/T 228.1-2010used in linear elastic deformation phase.On the other hand,it is approximately accurate for equation F.1and F.2used in yield plastic deformation phase.The approximate accurate equation in theory is not wrong equation.更多还原