SRB frustrum 'smiley' cracking phenomenon study

机译：sRB frustrum'笑脸'开裂现象研究

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The thermal protection system installed on the SRB frustrums incurs the formation of debonds between the MSA-2 TPS material and the substrate. The debonds can lead to surface penetrating cracks, called 'smileys' near sealed fasteners and other surface discontinuities. The study concluded that the 'smileys' were caused as the result of stress risers caused by excess fastener sealant (PR-1422) and weakly bonded surfaces. Once the debond occurs, 'smileys' form when the debond area is sufficiently large. The loading for the debond and 'smiley' formation is seen to be depressurization at the vacuum conditions near the end of powered boost. The porous nature of the MSA-2 material covered by a vapor barrier paint provides internal pressure loading of the MSA-2 material. Recommendations for eliminating the problem include elimination of excess PR-1422 sealant and improved attention to bonding surface preparation.

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作者
Cruse, Thomas A.;
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年度 1993
页码 1-36
总页数 36
原文格式 PDF
正文语种 eng
中图分类工业技术;
关键词
CRACKING (FRACTURING); DEBONDING (MATERIALS); FAILURE; INTERNAL PRESSURE; SEALERS; SURFACE CRACKS; THERMAL PROTECTION; FASTENERS; PAINTS; POROSITY; PRESSURE REDUCTION; VACUUM;

机译：开裂（压裂）; DEBONDING（maTERIaLs）;失败;内部压力;封口机;表面裂纹;热保护;紧固件;油漆;孔隙度;减压;真空;

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SRB frustrum 'smiley' cracking phenomenon study

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