Fracture toughness of Cu-Al-Be shape memory alloys (SMA’s) is determined by using circumferentially notched round bar (CNRB) alloy specimens. Three different compositions of Beryllium (0.42, 0.45 and 0.47 wt. %) in Cu-Al-Be SMA’s are prepared by ingot metallurgy. Fracture toughness of CNRB specimens is investigated through uniaxial tensile loading (Mode-I type). This paper explains the determination of fracture toughness as a measure of stress intensity factor (SIF) and strain energy release rate (SERR). Four kinds of crack lengths are generated to examine the effect of notch configuration on SIF (KIC) and SERR (GIC) of SMA samples. Addition 0.47 wt. % of beryllium content shows higher fracture toughness value as compared to other two compositions. Stress intensity factor increases and Strain energy release rate decreases with increase in Crack length.
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机译：Cu-Al-Be形状记忆合金（SMA's）的断裂韧性是通过使用周向缺口圆棒（CNRB）合金试样确定的。通过铸锭冶金制备了三种不同成分的铍（分别为0.42、0.45和0.47 wt。％）在Cu-Al-Be SMA中。通过单轴拉伸载荷（I型）研究了CNRB试样的断裂韧性。本文解释了断裂韧性的确定方法，该方法是测量应力强度因子（SIF）和应变能释放速率（SERR）的方法。生成了四种裂纹长度，以检查缺口形状对SMA样品的SIF（K IC ）和SERR（G IC ）的影响。添加0.47重量％。与其他两种组合物相比，铍含量的5％表示较高的断裂韧性值。随着裂纹长度的增加，应力强度因子增加，应变能释放率降低。
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