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优化设计水泥基复合材料应变硬化性能研究 认领 引用 被引量:27
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作者 王晓刚 Folker.H.Wittmann 赵铁军 《混凝土与水泥制品》 2006年第3期46-49,共4页
对比研究了不同试验方法和纤维掺量下优化设计水泥基复合材料(ECC)的应变硬化性能。各种试验方法下ECC性能差别较大,楔形劈裂、单轴拉伸、三点弯曲、四点弯曲试验所得断裂能依次增大,说明裂缝开展区对ECC应变硬化性能具有很大影响。通... 对比研究了不同试验方法和纤维掺量下优化设计水泥基复合材料(ECC)的应变硬化性能。各种试验方法下ECC性能差别较大,楔形劈裂、单轴拉伸、三点弯曲、四点弯曲试验所得断裂能依次增大,说明裂缝开展区对ECC应变硬化性能具有很大影响。通过研究认为,四点弯曲试验是较为适合的试验方法。纤维掺量增加能提高ECC的断裂能,但掺量较高时易发生纤维结团现象,对其性能造成不利影响。 展开更多
关键词 水泥基复合材料 PVA纤维 延性 应变硬化 断裂能
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Influence of Boundary Effect on Fracture of Concrete 认领 引用
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作者 K Duan X Z Hu +1 位作者 F H Wittmann T Zhao 《青岛理工大学学报》 CAS 2010年第4期1-11,共11页
The recently-developed boundary effect concept and the associated asymptotic model are used to analyze size-dependent fracture of concrete specimens.It is shown that the dependence of concrete fracture on specimen siz... The recently-developed boundary effect concept and the associated asymptotic model are used to analyze size-dependent fracture of concrete specimens.It is shown that the dependence of concrete fracture on specimen size,crack and/or ligament length is due to the same mechanism,i.e.the interactions between the crack tip fracture process zone and specimen's boundaries.By introducing an equivalent crack length ae,dimension dependent fracture becomes equivalent to fracture of a large plate with a small edge crack,and therefore,follows the same relationship of the 'net' nominal strength σn versus ae.As a result,the size dependent fracture can be predicted using the data measured on different types of specimens.To demonstrate the flexibility and effectiveness of the asymptotic boundary effect model,previously published results of three test series are analyzed.Excellent agreement has been found.Implications of the successful prediction are discussed. 展开更多
关键词 boundary effect fracture of concrete asymptotic model
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