一、引言 应力—应变曲线(σ-ε曲线)提供样品在外力作用下所发生的变形、屈服、硬化及其应力诱发相变的有关信息。为保证试验数据的可靠性,往往采取规定尺寸的标准试样。但是,对于某些过程研究而言,小尺寸试样却能反映出更好的微观检测灵敏度。本文拟用实验证实并从统计的角度来讨论试样尺寸因素对形状记忆合金σ-ε曲线的影响。 I. INTRODUCTION The stress-strain curve (σ-ε curve) provides information on deformation, yielding, hardening and stress-induced phase transformation of a specimen under external forces. In order to ensure the reliability of the test data, often take the standard size of the sample. However, for some process studies, small size samples reflect better microscopic detection sensitivity. This paper intends to experimentally confirmed and statistically from the perspective of the size of the sample to discuss the shape memory alloy σ-ε curve.