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一、引言多年来国内外对断裂韧度 I_(1c)和 K_(1c)的换算一直采用如下的公式K_(1c)=(E)/(1-v~2)J_(1c) (1)然而,目前对 J_(1c)和 K_(1c)之间如何换算仍存在很大分岐。本文对在航空工业中广泛应用的一种 Ti-6Al-4V 合金,用40毫米厚的热轧板,采用三点弯曲试验法,在系统地研究了不同尺寸试件的 K_R 及 J_R 阻力曲线的特征,以及它们之间的相互关系以后,提出了条件 J积分 J_Q 的定义方法。由此换算得到的 K(J_Q)值能较好地符合于从大试样实测所得到的K_(1c)值。其误差不超过±4.0%。
I. INTRODUCTION The conversion of fracture toughness I_ (1c) and K_ (1c) at home and abroad has been using the following formula K_ (1c) = (E) / (1-v ~ 2) J_ (1c) However, there is still a great deal of divergence between J_ (1c) and K_ (1c). In this paper, a widely used Ti-6Al-4V alloy in the aviation industry, with 40 mm thick hot-rolled plate, using the three-point bending test, systematically studied the K_R and J_R resistance curves of different size specimens Features, and their interrelationships, the definition of conditional J-J is proposed. The value of K (J_Q) obtained by this conversion is in good agreement with the value of K_ (1c) measured from a large sample. The error does not exceed ± 4.0%.