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对于SA533BC1,1,HT80和KD32钢进行了如紧凑试验、ESSO试验和DCB试验之类的裂纹终止试验,以评价其裂纹终止韧性值。得到的主要结论如下: 1) 裂纹终止韧性是用对紧凑试验进行静态分析得到的K_(1a)予以评价的。 2) 用紧凑试验进行动态分析所确定的K_(1D)值大于K_(1a),但当K_(1a)/K_Q为1时K_(1D)接近于K_(1ao)K_Q是裂纹起始时的应力强度因子。 3) 由ESSO试验和DCB试验得到的K_(1a)和K_(ca)两者没有显著的差别,但在低温下由DCB试验得到的K_(ca)小于K_(1a)。 4) 在转变温度区,K_(1a)小于K_(1c)而大于K_(1do)在这个温度区,由J_(1c)确定的K_(1c)随温度的升高而降低并且小于K_(1a)。 5) 由2毫米夏比V型缺口冲击试验得到的断口形貌转变温度和吸收能是表示裂纹终止韧性的合理参量,而NDT温度却不是。
Crack termination tests such as compact test, ESSO test, and DCB test were performed on SA533BC1, 1, HT80 and KD32 steels to evaluate their crack end toughness values. The main conclusions are as follows: 1) The crack end toughness is evaluated by K_ (1a) obtained from the static analysis of the compact test. 2) The K_ (1D) value determined by the compact test is larger than K_ (1a), but K_ (1D) is close to K_ (1ao) when K_ (1a) / K_Q is 1 K_ Stress intensity factor. 3) There is no significant difference between K_ (1a) and K_ (ca) obtained by ESSO test and DCB test, but K_ (ca) obtained by DCB test at low temperature is less than K_ (1a). 4) In the transition temperature region, K_ (1a) is less than K_ (1c) and K_ (1do). In this temperature region, K_ (1c) determined by J_ (1c) decreases with increasing temperature and is less than K_ (1a) ). 5) The fracture topography transition temperature and absorption energy obtained from a 2 mm Charpy V-notch impact test are reasonable parameters indicative of the ultimate toughness of the crack, whereas the NDT temperature is not.