一种用于材料力学性能测试的新型原位拉伸系统

材料的原位拉伸、压缩、疲劳实验可以测量材料的强度、成形性、刚度、韧性等一系列力学参数，是评价材料力学性能的重要方法。文章针对近年来对小型样材极低速、高精度原位拉伸测试的需求，设计了一种新型原位拉伸实验系统，以速度闭环控制方式实现最大拉/压力4500 N、最小拉/压速率1 μm/s的技术指标。系统具有负载模式、位移模式和疲劳模式等多种测试模式，以及限位保护和过载保护功能，还可与扫描电镜或光学显微镜配合观测分析材料组织的微观变化过程。实测结果表明该系统可以适用于材料物理性能的评测与失效分析。

A novel in-situ tensile system for testing mechanical properties of materials

The in-situ tensile, compression and fatigue experiments of materials is an important method to evaluate the mechanical properties of the materials in terms of strength, formability, stiffness and toughness. In view of the demand of the in-suit tests in micro scale, with extremely low-speed and high-precision in-situ tensile tests in recent years, a novel in-situ tensile test system is designed, to realize a maximum tensile pressure of 4500 N and a minimum tension and compression speed of 1 μm/s by the speed closed-loop control. The system is built with various test modes such as the load mode, the displacement mode, and the fatigue mode. Meanwhile, the limit protection and overload protection functions are also available. It can also be used in combination with the SEM or the optical microscope to observe and analyze the microscopic changes of material structures. The measured results show that the system can be well applied in the evaluation of the physical properties and the failure analysis of materials.