Análisis de la fractura de una biela de compresor de refrigeración

this paper analysed the fracture of a connecting rod from a food product refrigeration compressor. according to the connecting rod-crank mechanism′s operating characteristics, the element being studied was subjected to variable load cycles. connecting rod loads are compressive in normal operating conditions; however, an increased friction coefficient induces flexion load. based on the connecting rod′s microstructures, fracture surface characterisation and stress state estimation, it was concluded that the failure originated in a breakdown of connecting rod-crankshaft lubrication causing scuffing, severe wear and a high friction coefficient. likewise, the results showed that when the friction coefficient increased to 0.4, then stress reached levels above those acceptable for the connecting rod material (molten aluminium-silicon alloy) being considered. manufacture defects, pores and cracks increased stress concentration, thereby contributing to the mechanical element′s failure.