...
首页> 外文期刊>Bulletin des Laboratoires des Ponts et Chaussees >Comportement en traction uni-axiale d'un composite cimentaire a ecrouissage positif a partir d'une approche inverse
【24h】

Comportement en traction uni-axiale d'un composite cimentaire a ecrouissage positif a partir d'une approche inverse

机译:正向硬化水泥复合材料单轴拉伸行为的反向研究

获取原文
获取原文并翻译 | 示例
           

摘要

The uniaxial tensile behavior of a fibered cement composite ― called "CEMTEC_(multiscale), and developed at the Laboratoire Central des Ponts et Chaussees (LCPC) facility ― has been determined by means of an inverse approach. This approach relies upon modeling the mechanical behavior of structural elements, either the slab or rib type, submitted to a four-point bending for which the parametric calibration allows deriving the uniaxial behavior of the material. Various experimental results, intended to illustrate the strain-hardening and non-localizing behavior of the material over the pre-peak phase during both the direct tension and four-point bending tests conducted at the LCPC, serve to justify the use of a strain-hardening elastoplastic model when performing numerical simulations with the CESAR-LCPC finite element computation code. In this manner, it has been shown that the uniaxial tensile behavior identified from the inverse analysis is, for the specific cement composite under study, characterized by: a high strength value (above 20 MPa), high ductility (maximum deformations of 5.10~(-3) for a structural element acting as a thin slab and 6.10~(-3) for an element acting as a rib), dependence on the preferential fiber direction, and nonexistent scale effects.
机译:纤维水泥复合材料的单轴拉伸行为称为“ CEMTEC_(multiscale)”,并且是通过逆向方法确定的,该方法是在蓬特-中央市政厅(LCPC)实验室开发的。该方法依赖于对机械行为进行建模。平板或肋骨类型的结构元件经过四点弯曲后,通过参数校准可以得出材料的单轴行为,各种实验结果旨在说明材料的应变硬化和非局部行为。在LCPC上进行的直接拉伸和四点弯曲测试期间,材料在峰前阶段均有效,当使用CESAR-LCPC有限元计算代码进行数值模拟时,可以证明使用应变硬化弹塑性模型是合理的。以这种方式,已经表明从反分析中确定的单轴拉伸行为是对于特定水泥复合材料在风洞,其特征在于:高强度值(高于20 MPa),高延展性(用作薄板的结构元件的最大变形为5.10〜(-3),用作肋骨的元件的最大变形为6.10〜(-3) ),对优先纤维方向的依赖以及不存在的比例效应。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号