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Fracture in Phenolic Impregnated Carbon Ablator

机译：酚醛浸渍碳烧蚀剂的断裂

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摘要

This paper describes the development of a novel technique to understand the failure mechanisms inside thermal protection materials. The focus of this research is on the class of materials known as phenolic impregnated carbon ablators. It has successfully flown on the Stardust spacecraft and is the thermal protection system material chosen for the Mars Science Laboratory and SpaceX Dragon spacecraft Although it has good thermal properties, structurally, it is a weak material. To understand failure mechanisms in carbon ablators, fracture tests were performed on FiberForm~®8 (precursor), virgin, and charred ablator materials. Several samples of these materials were tested to investigate failure mechanisms at a microstructural scale. Stress-strain data were obtained simultaneously to estimate the tensile strength and toughness. It was observed that cracks initiated and grew in the FiberForm when a critical stress limit was reached such that the carbon fibers separated from the binder. However, both for virgin and charred carbon ablators, crack initiation and growth occurred in the matrix (phenolic) phase. Both virgin and charred carbon ablators showed greater strength values compared with FiberForm samples, confirming that the presence of the porous matrix helps in absorbing the fracture energy.
机译：本文介绍了一种了解热保护材料内部失效机理的新技术的发展。这项研究的重点是被称为酚醛浸渍碳烧蚀剂的材料类别。它已成功在星尘飞船上飞行，是火星科学实验室和SpaceX Dragon航天器选择的热保护系统材料。尽管它具有良好的热性能，但在结构上却是一种较弱的材料。为了了解碳烧蚀器的失效机理，对FiberForm®®8（前体），原始和烧焦的烧蚀器材料进行了断裂测试。测试了这些材料的几个样品，以研究微观结构的失效机理。同时获得应力-应变数据以估计拉伸强度和韧性。可以观察到，当达到临界应力极限时，裂纹会在FiberForm中引发并扩展，从而使碳纤维与粘合剂分离。但是，对于原始和烧焦的碳烧蚀器，裂纹萌生和扩展都发生在基体（酚醛）相中。与FiberForm样品相比，原始碳烧焦器和烧焦碳烧蚀器均显示出更高的强度值，从而证实了多孔基质的存在有助于吸收断裂能。

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  • 来源
    《Journal of Spacecraft and Rockets》 |2013年第4期|735-741|共7页
  • 作者

    Parul Agrawal; Jose F. Chavez-Garcia; John Pham;

  • 作者单位

    ERC Corporation, NASA Ames Research Center, Moffett Field, California 94035;

    ERC Corporation, NASA Ames Research Center, Moffett Field, California 94035;

    University Space Research Associates, NASA Ames Research Center, Moffett Field, California 94035;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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