Dr Zhou has been teaching and undertaking research in different aspects of marine engineering for over 20 years. He has published over 40 technical papers on diesel engine studies. Prof Xiaojiang Ma is a leading expert in fault diagnosis and vibration analysis at the Dalian University of Technology. His specific interests lie in fault diagnosis, pattern recognition and analysis of non-linear and non-stationary vibration signals.

This paper presents a comparison of the plastic collapse loads from experimental in-plane bending tests on three 90 degree single un-reinforced mitred pipe bends, with the results from various 3D solid finite element models. The bending load applied reduced the bend angle and in turn, the resulting cross-sectional ovalisation led to a recognised weakening mechanism, which is only observable by testing or by including large displacement effects in the plastic finite element solution. A small displacement limit solution with an elastic-perfectly-plastic material model overestimated the collapse load by 40%. The plastic collapse finite element solution produced excellent agreement with experiment

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