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读者: 刊载于《金属学报》第11卷(1975年)第2期第174页上的“论J积分和裂纹顶端张开位移间的关系”一文,翻阅以后,碰见有一处排印错误和两个问题。为了学报能办得更好,研究工作能作得更好,提出来供有关同志参考。1.“T (?)u/(?)x”应是“T·(?)u/(?)x”。2.在数学存在论与物理现象两方面,都没有一个“塑性应变能密度”存在。dwp应改为(?)w_p,即微塑性应变功密度,非全微分型。3.在固体力学领域内只有一个应变能密度,即弹性应变能密度w:
Readers: The article “On the Relationship Between J Integral and Opening Displacement at Crack Tip,” in Volume 11 of the Journal of the Society of Metallications (1975), No. 2, page 174, after reading it, we see a typographical error and two problem. For the journal to be able to do a better job, the research work can be done better, put forward for the comrades for reference. 1. “T (?) U / (?) X” should be “T · (?) U / (?) X”. 2. There is not a “plastic strain energy density” in both mathematical ontology and physical phenomena. dwp should be changed to (?) w_p, that is, the functional density of micro-plastic strain, non-total differential type. 3. In the field of solid mechanics there is only one strain energy density, that is, the elastic strain energy density w: