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0 IntroductionWhetherweldmetalsolidificationcrackoccursornotdependsonfollowingconditions[1,2]:theBrittleTemperatureRange(BTR)ofthematerial,itsductilityinBTR,thatis,materialresistancetothecrack,andthestrainintheBTR,thatis,themechanicaldrivingforceforthecrack.… 相似文献
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The adhesion of thermally sprayed coatings is an important subject for engineers applying thermal spray pro-cess.The single pendulum impact scratch test is the most popular method in the tribological inwestigation of modified sur-faces of materials. In this paper,the adhesion of thermally sprayed coatings has been investigated using this testmethod .The key of evaluation for thermally sprayed coatings is the sheer strength of coatings obtained in the test.Theresults show that the test method is reproducible ,reliable and easy to perform,and does not require expensive equip-ment.The procedure proposed in the test method for evaluating the adhesion of coatings is more reliable and realistic thanothers. 相似文献
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Based on the Almen method,the authors have modified this test method so that the results of the simple testcan be correlated to the absolute values of residual stress measured fy conventional methods such as X-ray diffraction ormechanical techniques.The technique utilizes changes in the strain of standardized test substrates, which is measured byBHP-700℃ temperature-compensated reststance strain gauges, as an indication of the level of residual stress in thesprayed coatings. Based on the concept that the sprayed coating on the surface of substrate with residual stresses acts aforce (N) and bending momeat (M) on the test piece,the calculating equation of residual stress in the coatings hasbeen proposed. The results of the test method showed that the technique is potentially reliable and accurate, althoughdeficiencies and many controversies are still exist. 相似文献
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分别详细分析了焊接热源的三种计算模型即高斯热源模型、双椭圆高斯热源模型及双椭球热源模型的数学表达式与物理特点。利用三维有限元网格划分技术,对工件进行网格划分,并采用网格自适应技术对焊缝金属的网格进行自动加密与生成,为缩短焊接过程数值模拟时间创造了条件。在此基础上又对其中两种焊接热源模型所建立的温度场进行了计算,得到了不锈钢SUS310材料温度场的分布规律,研究了各种参数对温度场分布的影响,并与工艺试验结果进行了比较,提出了适合三维有限元分析的最佳焊接热源模型。 相似文献
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