Use of Toughness Data in Specification Design and Performance Evaluation of Fiber Cement Composites

韧性数据在纤维水泥复合材料规格设计和性能评估中的应用

• 批准号: 8819803
• 负责人: Vellore Gopalaratnam
• 金额: $ 5.02万
• 依托单位: University of Missouri-Columbia
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-04-01 至 1992-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8819803&HistoricalAwards=false
• 关键词: Use; Toughness; Data; Specification; Design

Improved fracture and impact resistance are among the improved attributes of fiber reinforced concrete (FRC). Toughness, which is a measure of the energy absorption capacity, is used to characterize FRC's ability to resist fracture when subjected to static, dynamic and impact loads. The debate on how it is measured, interpreted and used is still inconclusive. The objectives of the research program are hence to (a) investigate the influence of specimen size, loading configuration, and loading rate on the load-deformation characteristics of FRC (energy absorption, flexural strength, first-crack strength and elastic modulus), (b) evaluate the effectiveness of the currently used toughness indices and associated specifications, (c) provide an analytical basis for the interpretation and use of the strength and toughness data, and (d) recommend guidelines for the use of flexural strength and toughness data in specification, design and performance evaluation. The investigation comprises experimental and analytical components. Since the scope of the problem is extensive and since statistically significant toughness data needs to be generated, an inter-university testing program involving 6 universities is included. As an outcome of the study, specific recommendations will be made on the use of toughness data in specification, design and performance evaluation of fiber cement composites.

改进的抗断裂性和抗冲击性属于改进的 纤维增强混凝土（FRC） 坚韧，这 是能量吸收能力的量度，用于 表征FRC在经受以下条件时的抗断裂能力 静态、动态和冲击载荷。 关于它是如何 衡量、解释和使用的标准仍然没有定论。 的 因此，研究计划的目标是（a）调查 试样尺寸、载荷配置和 加载速率对FRC荷载-变形特性的影响 （能量吸收、弯曲强度、初裂强度和 弹性模量），（B）评估当前 使用的韧性指数和相关规范，（c）提供 解释和使用《公约》的分析基础 强度和韧性数据，以及（d）建议准则， 在规范中使用弯曲强度和韧性数据， 设计和性能评价。 述调查包括 实验和分析组件。 由于范围 问题是广泛的，因为统计意义 需要生成韧性数据， 包括涉及6所大学的项目。 的成果是 该研究将提出具体建议， 规格、设计和性能中的韧性数据 纤维水泥复合材料的评价