An expanded and extended discussion of a paper titled “Analysis of the Causes of Fracture in Compressor Piston Rods and Bolts”

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This post was last edited by *nht1 on 2025-5-3 08:46: Analysis of the reasons for fracture of compressor piston rods and bolts... (qq.com). I read this article carefully and found it very useful; however, I have a few questions that I hope the experts can help answer: 1. The fastening bolts used for the compressor cylinder body are made of 45 steel – is this material less suitable for such high-load conditions compared to 35CrMoA? 2. Looking at the location where the bolt breaks, it is of the A-type double-headed stud, with the thread ending at a point where it transitions into a smooth shaft; this represents a location of shape change. Does such a condition lead to greater stress concentration? Therefore, it is more reasonable to choose type B in this case, in order to address the issues of stress discontinuity and concentration at points of shape change 3. For this type of alternating load with hydrogen as the medium, when an overload occurs, should it be given priority to consider thread failure first, or bolt fracture first? 4. Are the compressor failures caused by overload or manufacturing defects? I hope fellow sailors can provide additional information on the operating conditions, so that we can discuss together, learn from each other, and make progress together