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排序方式: 共有80条查询结果,搜索用时 11 毫秒
71.
72.
水泥基复合材料的高脆性是诱发结构开裂、腐蚀甚至失去承载能力的主要原因.PVA纤维增强水泥基复合材料(SHCC)的应变硬化特性和多微缝开裂特征可显著改善此类材料的性能.通过三点受弯和直拉试验对比了骨料颗粒级配合理与否对SHCC材料力学性能的影响.结果表明:适宜的颗粒级配可以显著改善SHCC的应变硬化特性,骨料的最大粒径可以由ECC材料常用的110μm放大到1.25 mm,便于此类材料在实际工程中的推广应用. 相似文献
73.
Zhongping Zhang Wenzhen Zhao Qiang Sun Chunwang Li 《Journal of Materials Engineering and Performance》2006,15(1):19-22
The purpose of the present article is to theoretically calculate the strain-hardening exponent and the strength coefficient
of metallic materials. For this purpose, two equations are used. The first one correlates the strain-hardening exponent and
the strength coefficient with the yield stress-strain behavior, while the other one correlates the fracture strength and the
fracture ductility. From these two equations, the expressions of both the strain-hardening exponent and the strength coefficient
are deduced. Theoretical results from the deduced expressions are then compared with test data. Through the comparison of
equations and data, if adequate test data are lacking, the deduced expressions can be used to theoretically calculate the
strain-hardening exponent and the strength coefficient for metallic materials. The characteristics of the theoretical approach
are simple and easy to use. In addition, the theoretical results can be further applied to examine the correctness of the
test data. 相似文献
74.
75.
通过对常规三轴仪进行改装,开展最大竖向应变达50%的城市固体废弃物(MSW)三轴剪切试验。试验表明:大应变条件下MSW试样发生破坏且其破坏应变随填埋深度增大而减小。通过组分分离得到MSW的基本相和加筋相,并对其分别进行三轴固结排水剪切(CD)试验,发现其应力–应变曲线均呈应变硬化型。在此基础上,对基本相进行筛分,并结合不同粒径粒组的微观结构阐述基本相中有机纤维体的存在形式及其加筋作用机制。进一步对各粒组进行CD试验,发现除粒径小于0.075 mm的粒组外其余粒组的应力–应变关系均表现为应变硬化。通过基本相灼烧前后的CD试验比较,发现有机纤维体在应变达到一定程度后才开始发挥加筋作用,且剪切过程中伴随着纤维体断裂以及纤维体与颗粒间滑移。最后,基于MSW的三轴剪切试验结果,分别对三轴固结不排水剪切(CU)试验和CD试验抗剪强度参数的确定方法进行探讨。 相似文献
76.
Sajad Ghaemifar 《Canadian Metallurgical Quarterly》2017,56(4):459-463
The effect of repetitive intercritical annealing on the mechanical properties and work-hardening response of a typical C–Mn dual-phase (DP) steel was studied by consideration of different pre-intercritical annealing microstructures and martensite volume fractions. It was revealed that the DP steels produced from the initial martensitic microstructure have much better mechanical properties compared with those originated from the ferritic–pearlitic banded microstructure. The repetitive intercritical annealing of the initial martensitic microstructure was effective for the enhancement of strength–ductility balance, where at a comparable ductility; a twofold increase in the tensile strength was obtained. Finally, these results were discussed based on the Crussard–Jaoul work-hardening rate analysis. 相似文献
77.
A. N. Mailo 《Strength of Materials》2009,41(4):449-454
We have assessed the characteristic of local inelasticity distribution, which controls the evolution of microstructural processes
in a loaded surface layer of D16T structural aluminum alloy specimen in view of the strain-hardening stages and deformation
mechanism changeover. The deformation stages for static tensile conditions are correlated with the characteristic of local
inelasticity distribution, in order to determine the relationship between the deformation mechanism changeover and local inelasticity
kinetics for the transition point from strain-hardening to strain-softening of the alloy under study.
Translated from Problemy Prochnosti, No. 4, pp. 141–148, July–August, 2009. 相似文献
78.
M.S. Kaiser S. Datta A. Roychowdhury M.K. Banerjee 《Journal of Materials Engineering and Performance》2008,17(6):902-907
Effect of aging on the mechanical properties of Al-6Mg alloy doped with varying concentration of scandium ranging from 0.2
to 0.6 wt.% is analyzed. As-cast samples were aged isochronally for 60 min at different temperatures ranging from 100 to 500 °C.
Evaluation of mechanical properties of the aged Al-6Mg (Sc) alloys was done by employing an Instron testing machine. Various
strain rate of testing were used to find out the values of strain-rate sensitivity of the experimental alloys. The influence
of scandium is much pronounced on yield strength than on the tensile strength. Alloys with higher scandium content have shown
higher yield strength and the values of strain-rate sensitivity ‘m’ at peak-aged condition have been found to be comparatively high at higher scandium concentration. The fracture of the experimental
alloys occurs through microvoid coalescence. 相似文献
79.
R. Cada 《Journal of Materials Processing Technology》1996,60(1-4):283-290
The paper concerns evaluation and comparison of formability of steel strips, which are used in Czech Republic for production of intricate deep stampings. The properties of sheet-metal which have the principal influence upon the success of deep drawing or strech-forming are described. Two methods used for determination of strain-hardening exponent are compared. It is concluded, that the method according to
SN 42 0436 is suitable for approximation of stress-strain curve of given sheet-metal only from point of view of functional values. The values of strain-hardening exponent, calculated by the method using maximum uniform elongation, are more strongly correlated with pure stretchability than are the values of it, calculated by the method according to
SN 42 0436. 相似文献
80.
A mathematical model is developed to consider the impact of microstructural parameters, including the volume fraction and the average particle size of martensite, on the flow stress and strain-hardening behavior of dual-phase microstructure. In this regard, the micromechanical approach is applied for partitioning the stress and strain in ferrite and martensite. Martensite carbon content and geometrically necessary dislocations, generated from austenite-to-martensite transformation, and strain accommodation at the ferrite–martensite interface, are involved to modify the partitioned stress of martensite and ferrite, respectively. Having partitioned stress in each phase, the global stress is estimated as the function of steel chemical composition, ferrite grain size, martensite particle size, aspect ratio, and volume fraction. To evaluate the applicability of the proposed model, four dual-phase steels containing 12, 25, 34, and 48% volume fractions of martensite are prepared from the intermediate quenching process, and then after the strain-hardening stages are investigated. Comparing the experimental result and model output reveals that the presented model shows good predictive capabilities to identify strain-hardening stages and estimate the inverse of the strain-hardening exponent. 相似文献