4.1 This test method may be used for material development, material comparison, quality assurance, characterization, and design data generation.
4.2 Continuous fiber-reinforced ceramic matrix composites generally characterized by fine grain sized (<50 μm) matrices and ceramic fiber reinforcements are candidate materials for structural applications requiring high degrees of wear and corrosion resistance, and high-temperature inherent damage tolerance (that is, toughness). In addition, continuous fiber-reinforced glass (amorphous) matrix composites are candidate materials for similar but possibly less-demanding applications. Although flexural test methods are commonly used to evaluate strengths of monolithic advanced ceramics, the non-uniform stress distribution of the flexure specimen in addition to dissimilar mechanical behavior in tension and compression for CFCCs lead to ambiguity of interpretation of strength results obtained from flexure tests for CFCCs. Uniaxial-loaded tensile strength tests provide information on mechanical behavior and strength for a uniformly-stressed material.
4.3 Unlike monolithic advanced ceramics which fracture catastrophically from a single dominant flaw, CFCCs generally experience “graceful” fracture from a cumulative damage process. Therefore, the volume of material subjected to a uniform tensile stress for a single uniaxially-loaded tensile test may not be as significant a factor in determining the ultimate strengths of CFCCs. However, the need to test a statistically significant number of tensile test specimens is not obviated. Therefore, because of the probabilistic nature of the strength distributions of the brittle matrices of CFCCs, a sufficient number of test specimens at each testing condition is required for statistical analysis and design. Studies to determine the exact influence of test specimen volume on strength distributions for CFCCs have not been completed. It should be noted that tensile strengths obtained using different recommended tensile specimens with different volumes of material in the gage sections may be different due to these volume differences.
4.4 Tensile tests provide information on the strength and deformation of materials under uniaxial tensile stresses. Uniform stress states are required to effectively evaluate any nonlinear stress-strain behavior which may develop as the result of cumulative damage processes (for example, matrix cracking, matrix/fiber debonding, fiber fracture, delamination, etc.) which may be influenced by testing mode, testing rate, processing or alloying effects, or environmental influences. Some of these effects may be consequences of stress corrosion or subcritical (slow) crack growth that can be minimized by testing at sufficiently rapid rates as outlined in this test method.
4.5 The results of tensile tests of test specimens fabricated to standardized dimensions from a particular material or selected portions of a part, or both, may not totally represent the strength and deformation properties of the entire, full-size end product or its in-service behavior in different environments.
4.6 For quality control purposes, results derived from standardized tensile test specimens may be considered indicative of the response of the material from which they were taken for, given primary processing conditions and ......
常见的拉伸试验结果:最大载荷最大载荷下的挠度最大载荷做功刚度断裂载荷断裂时的形变断裂做功弦斜率应力应变杨氏模量试验仪器:万能试验机,高速试验机等图一 金属铝拉伸强度部分测试标准:GB/T 6397-1986《金属拉伸试验试样》ASTM D3039-76用于测定高模量纤维增强聚合物复合材料面内拉伸性能ASTM D638用于测定试件的拉伸强度和拉伸模量2、压缩试验 压缩试验是一种常用于测定材料的压缩负载或抗压性的试验方法...
常见的拉伸试验结果:最大载荷最大载荷下的挠度最大载荷做功刚度断裂载荷断裂时的形变断裂做功弦斜率应力应变杨氏模量试验仪器:万能试验机,高速试验机等图一 金属铝拉伸强度部分测试标准:GB/T 6397-1986《金属拉伸试验试样》ASTM D3039-76用于测定高模量纤维增强聚合物复合材料面内拉伸性能ASTM D638用于测定试件的拉伸强度和拉伸模量2、压缩试验 压缩试验是一种常用于测定材料的压缩负载或抗压性的试验方法...
常见的拉伸试验结果:最大载荷最大载荷下的挠度最大载荷做功刚度断裂载荷断裂时的形变断裂做功弦斜率应力应变杨氏模量试验仪器:万能试验机,高速试验机等图一 金属铝拉伸强度部分测试标准:GB/T 6397-1986《金属拉伸试验试样》ASTM D3039-76用于测定高模量纤维增强聚合物复合材料面内拉伸性能ASTM D638用于测定试件的拉伸强度和拉伸模量2、压缩试验 压缩试验是一种常用于测定材料的压缩负载或抗压性的试验方法...
常见的拉伸试验结果:最大载荷最大载荷下的挠度最大载荷做功刚度断裂载荷断裂时的形变断裂做功弦斜率应力应变杨氏模量试验仪器:万能试验机,高速试验机等图一 金属铝拉伸强度部分测试标准:GB/T 6397-1986《金属拉伸试验试样》ASTM D3039-76用于测定高模量纤维增强聚合物复合材料面内拉伸性能ASTM D638用于测定试件的拉伸强度和拉伸模量2、压缩试验 压缩试验是一种常用于测定材料的压缩负载或抗压性的试验方法...
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