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一、问题的提出及实际意义涡喷—6发动机用GH36合金钢制造的涡轮盘,使用中经常出现裂纹。修理过程中由于发现槽底裂纹超过了技术规定的1.5mm,使报废的一级涡轮盘达20％左右,造成很大损失。所以我们试图用断裂力学方法估计涡轮盘槽底裂纹的临界尺寸和对于使用一个寿命或若干寿命下的最大容许初始裂纹尺寸,以使裂纹的修理深度建立在更合理的基础上,以及放宽修理深度的规定,修改旧的修理规范,真正做到物尽其用。
First, the issue put forward and practical significance Turbocharger -6 GH36 alloy steel turbine disc, the use of frequent cracks. Repair process because the groove bottom cracks found to exceed the technical requirements of 1.5mm, so that scrapped a turbine disk up to 20%, resulting in great losses. So we try to use fracture mechanics method to estimate the critical size of turbine disk bottom crack and the maximum allowable initial crack size for one life or several working life so as to make the crack repair depth more reasonable basis and to relax the repair depth The provisions of the old repair specifications to amend and truly make the best use.