• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>ASME Pressure Vessels and Piping conference >NEGATIVE LOAD RATIO FATIGUE CRACK GROWTH RATE TESTING ON AUSTENITIC STAINLESS STEEL IN A SIMULATED PRIMARY WATER ENVIRONMENT
【24h】

NEGATIVE LOAD RATIO FATIGUE CRACK GROWTH RATE TESTING ON AUSTENITIC STAINLESS STEEL IN A SIMULATED PRIMARY WATER ENVIRONMENT

机译：模拟主水环境中奥氏体不锈钢的负载荷比疲劳裂纹扩展速率测试

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Light water reactor coolant environments are known to significantly enhance the fatigue crack growth rate of austenitic stainless steels. However, most available data in these high temperature pressurized water environments have been derived using specimens tested at positive load ratios, whilst many plant transients involve significant compressive as well as tensile stresses. The extent to which the compressive loading impacts on the environmental enhancement of fatigue crack growth and more importantly on the processes leading to retardation of those enhanced rates is therefore unclear, potentially leading to excessive conservatism in current assessment methodologies. A test methodology using corner cracked tensile specimens has been developed which provides significant advantages over more conventional specimen geometries in terms of autoclave testing at negative load ratios. Finite element analysis of the specimen geometry has been performed to generate effective stress intensity factors, K_(eff), for specimens loaded in fully reverse loading. Test data generated in both air and water are compared to conventional compact tension specimen data to validate the test methodology.
机译：已知轻水反应堆冷却剂环境会显着提高奥氏体不锈钢的疲劳裂纹增长率。但是，在这些高温加压水环境中，大多数可用数据都是使用在正负荷比下测试的标本得出的，而许多工厂瞬变都涉及显着的压应力和拉应力。因此，尚不清楚压缩载荷对疲劳裂纹扩展的环境增强的影响程度，更重要的是对导致这些增强率的延迟产生影响的过程的影响尚不清楚，这可能导致当前评估方法中的过度保守。已经开发出一种使用角裂纹拉伸试样的测试方法，该方法在负载荷比下进行高压灭菌器测试时，与更常规的试样几何形状相比具有明显的优势。对于完全反向加载的样品，已经对样品几何形状进行了有限元分析，以生成有效的应力强度因子K_（eff）。将空气和水中产生的测试数据与传统的紧凑型拉伸试样数据进行比较，以验证测试方法。

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