To provide convenience for the translation among specimens, orthogonal experimental method was used to research the relationship between geometrical dimensions （length, width and thickness） and total elongation of p...To provide convenience for the translation among specimens, orthogonal experimental method was used to research the relationship between geometrical dimensions （length, width and thickness） and total elongation of polycarhonate sheet, and simulations of tensile specimens with different geometrical dimensions had been conduc- ted by the finite element method, then regression analysis method was used to create the relationship formula be- tween geometrical dimensions and total elongation. It was found that： the shorter the length of specimen is, the better the plasticity is, and they had the power exponent relationship; the larger the width and thickness are, the better the plasticity is, and they had the direct proportion relationship with the total elongation.展开更多
伴随结构精细化、小型化的发展,薄板、薄壁管件等小尺寸构件得到应用,试样小型化对满足特殊取样要求和材料断裂韧度测试需求有重要工程意义,而基于非标小试样的材料断裂性能测试方法尚难满足需求。设计用于延性材料断裂韧度测试的C形环...伴随结构精细化、小型化的发展,薄板、薄壁管件等小尺寸构件得到应用,试样小型化对满足特殊取样要求和材料断裂韧度测试需求有重要工程意义,而基于非标小试样的材料断裂性能测试方法尚难满足需求。设计用于延性材料断裂韧度测试的C形环小试样,提出应用该类小尺寸试样获取材料延性断裂韧度的、基于量纲一载荷分离理论的规则化测试方法。分别采用C形环小试样和传统紧凑拉伸型(Compact tension,CT)大试样完成转子材料26Ni Cr Mo V11-5钢和压力容器材料A508-Ⅲ钢的J阻力曲线试验,讨论C形环小试样厚度、初始裂纹长度对试验结果的影响。结果表明,试样厚度和初始裂纹长度对C形环的J阻力曲线测试结果影响有限,但C形环试样裂尖具有更高的约束水平,由C形环试样得到的J阻力曲线明显低于CT试样的结果。展开更多
基金Sponsored by the National Natural Science Foundation of China (Grant No. 50675044)the Heilongjiang Provincial Natural Science Foundation Key Program (Grant No. ZD200811)
文摘To provide convenience for the translation among specimens, orthogonal experimental method was used to research the relationship between geometrical dimensions （length, width and thickness） and total elongation of polycarhonate sheet, and simulations of tensile specimens with different geometrical dimensions had been conduc- ted by the finite element method, then regression analysis method was used to create the relationship formula be- tween geometrical dimensions and total elongation. It was found that： the shorter the length of specimen is, the better the plasticity is, and they had the power exponent relationship; the larger the width and thickness are, the better the plasticity is, and they had the direct proportion relationship with the total elongation.
文摘伴随结构精细化、小型化的发展,薄板、薄壁管件等小尺寸构件得到应用,试样小型化对满足特殊取样要求和材料断裂韧度测试需求有重要工程意义,而基于非标小试样的材料断裂性能测试方法尚难满足需求。设计用于延性材料断裂韧度测试的C形环小试样,提出应用该类小尺寸试样获取材料延性断裂韧度的、基于量纲一载荷分离理论的规则化测试方法。分别采用C形环小试样和传统紧凑拉伸型(Compact tension,CT)大试样完成转子材料26Ni Cr Mo V11-5钢和压力容器材料A508-Ⅲ钢的J阻力曲线试验,讨论C形环小试样厚度、初始裂纹长度对试验结果的影响。结果表明,试样厚度和初始裂纹长度对C形环的J阻力曲线测试结果影响有限,但C形环试样裂尖具有更高的约束水平,由C形环试样得到的J阻力曲线明显低于CT试样的结果。
