Characterization of Thermal-Mechanical Fatigue Responses of Structural Materials under Multiaxial Strain Cycling

多轴应变循环下结构材料的热机械疲劳响应表征

• 批准号: 9215694
• 负责人: Sam Zamrik
• 金额: $ 16万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-07-15 至 1997-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9215694&HistoricalAwards=false
• 关键词: Characterization; Thermal; Mechanical; Fatigue; Responses

9215694 Zamrik A series of multiaxial thermal-mechanical fatigue (TMF) tests are to be conducted using two structural materials: type 316 stainless steel and Nickel-base superalloy Waspaloy. The TMF tests will be conducted in continuous cycling modes and with holds-in- strain/temperature imposed on the continuous cycling waveforms. The hold-periods are imposed in the TMF loading cycles to induce time dependent effects such as creep and oxidation. The objective of this research is to characterize the mechanical and micromechanical TMF responses of these two materials under multiaxial isothermal fatigue and creep-fatigue responses of these two structural materials from available data. Extensive microstructural evaluations of the fracture and failure processes of these two materials will be conducted in order to develop a physical-based universal life prediction concept. A universal multiaxial fatigue life prediction concept developed for the isothermal case will be applied to the multiaxial TMF data obtained in this research study. ***

9215694 Zamrik将使用两种结构材料进行一系列多轴热机械疲劳试验：316型不锈钢和镍基高温合金瓦氏合金。TMF测试将在连续循环模式下进行，并对连续循环波形施加应变/温度保持。在TMF加载循环中施加保持期，以引起蠕变和氧化等随时间变化的效应。本研究的目的是从现有的数据中表征这两种材料在多轴等温疲劳和蠕变疲劳响应下的力学和细观力学TMF响应。将对这两种材料的断裂和失效过程进行广泛的微观结构评估，以开发基于物理的通用寿命预测概念。为等温情况开发的通用多轴疲劳寿命预测概念将应用于本研究中获得的多轴TMF数据。***