热应力裂纹的启动没有利用机械力。
The thermal stress cracking is initiated without the use of mechanical force.
优选地，利用燃烧器，通过增加供给给玻璃的能量，来启动热应力裂纹。
Preferably, the burner is used to initiate the thermal stress crack, by increasing the power supplied to the glass.
高温蠕变损伤是由于过热引起的，过热使金相组织内部产生蠕变空洞，在热应力下空洞扩展连接而形成蠕变裂纹。
Creep damage is mainly caused by superheat. Because of superheat, creep cavities are formed inside microstructure, under heat stress condition, growth and join of cavities induce creep cracking.
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