Abstract
This paper mainly studies the position of the contact surface of the first ring groove of the piston under the condition of thermal mechanical coupling under the service conditions of the piston component of high-power diesel engine at the temperature of 350°C-420°C and the detonation pressure of the piston top of 28Mpa. For typical NDT defects such as surface crac0k, internal crack, shrinkage cavity and cold lap, the sensitivity of scale, morphology and position and their quantitative relationship. The crack defect on the upper joint surface of the piston ring causes the maximum stress in the range of 56.8 MPa-81.3 MPa. Among them, 8% of the circumference of a single defect will cause material damage and failure. Defects larger than this scale must be detected in eddy current NDT.
Published Version
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