摘要
在材料的断裂与疲劳问题的研究中,裂纹尖端的闭合行为一直是人们十分关注的课题,它是深入研究材料断裂和疲劳机理的重要基础,然而精确地检测裂纹闭合行为的重要参数——裂纹张开载荷P_(op)仍是一个研究课题。高精度裂纹闭合测试仪的研制成功,则提供了有效的研究手段。本文重点介绍仪器的设计原理,电路的设计及其应用实例。
The fatigue crack closure behavior near the crack tip is a spectacular subject in the field of fracture and fatigue. The crack opening load ρ_op is the most important parameter characterizing the crack closure effect. The crack opening loadρ_op, however, can not be properiy determined by using of the conventionally experimental method. The SLB-II digital instrument developed here provides an effective means to measure accurately the ρ_op load. In this paper, the principle of measurement, the idea of circuit design and the application of this instrument are introduced in details.
关键词
裂纹闭合
裂纹张开载荷
运算放大器
crack closure, crack ope ning load, operationai amplifier,compensating circuit
