论文部分内容阅读
双剪切试样是设计用于研究镍基单晶超合金的蠕变问题。本文研究该试样详细的蠕变应力和应变分布以及边界条件的影响。计算结果表明 ,利用 ABAQUS中的 RIGID SURFACE作为边界的初步分析是保守的 ,因为它只能保证在 10 %蠕变应变内的精确性。利用更真实的边界条件 (ABAQUS中的 CONTACT PAIR) ,能给出更均匀和更高应变时的精确性。建立了材料蠕变性能参数 (Norton律 )和双剪切试样宏观响应的关系 ,使得能够利用双剪切试样试验来确定材料蠕变性能参数 ,并已给出了相应的公式。本文利用镍基单晶超合金的试验数据对镍基单晶超合金双剪切试样进行分析 ,并与试验结果进行对比 ,结果相当一致
Double-shear specimens are designed to investigate the creep problems of nickel-based single crystal superalloys. In this paper, the detailed creep stress and strain distribution and the influence of boundary conditions of this sample are studied. The calculations show that a preliminary analysis using the RIGID SURFACE in ABAQUS as a boundary is conservative because it only guarantees accuracy within a 10% creep strain. With more realistic boundary conditions (CONTACT PAIR in ABAQUS), accuracy can be given for more uniform and higher strain. The relationship between material creep property parameters (Norton’s law) and macroscopic response of double-shear specimens was established, so that the parameters of creep properties of materials can be determined by double-shear specimen test and corresponding formulas have been given. In this paper, nickel-based single crystal superalloy test data of nickel-based single crystal superalloy double shear specimens were analyzed and compared with the test results, the results are quite consistent