Failure Analysis of Cracking of Cast Aluminum Alloy Manhole Cover

Author:

Ren Facai1,Li Hezong2

Affiliation:

1. Shanghai Institute of Special Equipment Inspection and Technical Research, Shanghai 200062, China

2. Key Laboratory of Intelligent Industrial Equipment Technology of Hebei Province, Hebei University of Engineering, Handan 056038, China

Abstract

In this paper, the abnormal fracture failure of a ZL104 aluminum alloy quick-opening manhole cover of a cement tank truck is systematically studied to discover the root cause of an accident. The unloading operation procedures of cement tank trucks, the effectiveness of safety valves, the chemical composition, mechanical properties and material quality of aluminum alloy manhole covers, and the macroscopic and microscopic morphology of fractures were comprehensively analyzed. The results show that although the Mg content in the chemical composition of an aluminum alloy manhole cover exceeds the standard, it is not the root cause of the accident. The root cause of the failure is that, during the unloading operation, the operator did not strictly follow the unloading procedures. One of the buckles was in the released state, which led to uplift cracking, resulting in the successive cracking and slipping of adjacent buckles, and the manhole cover finally cracked and flew out. Based on the failure causes, suggestions are put forward to prevent the manhole cover from failing during the unloading operation of cement tank trucks in the future.

Funder

Shanghai Bureau of Quality and Technical Supervision Research Project

Open Fund for Key Laboratory of Intelligent Industrial Equipment Technology of Hebei Province

Publisher

MDPI AG

Subject

General Materials Science

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