Application of Numerical and Physical Simulation to Design of the Best Manufacturing Technology for Fasteners

Kusiak, J.; Skóra, M.; Rauch, Ł.; Szeliga, Danuta; Pietrzyk, M.

doi:10.1515/amm-2015-0074

Cited by 2 publications

(1 citation statement)

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“…Tensile stress-strain measurements as a function of temperature and strain rate provide very useful information. [2][3][4] Structural faults, thermal stress, lack of mechanical resistance, environmental stress, working temperature above tempering (which could lead to the phase transition) could be considered the main reasons for fracture and deformation failure of molded parts. [5][6][7] Nikforooz et al 8 have studied fatigue behavior of laminated glass fiber-reinforced polyamide.…”

Section: Introduction *mentioning

confidence: 99%

Injection molded part material failure analysis

Solomon¹,

Solomon²

2020

Rev.Roum.Chim.

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In this study, the causes of the failure of an injection-molded polyamide part were analyzed. The working conditions of injection-molded parts are very complex depending on: pressure, temperature, friction, corrosion, etc. and, consequently, they could fail due to different reasons. Microscopic characterization, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and FTIR spectroscopy were used for fracture analysis of defected parts. Mechanical testing (flexural modulus, torque and notched Izod impact test) was also considered for part failure analysis. This analysis suggests that the parts have failed because they were overloaded during assembly operation, and their material was harder (in a transition state between ductile and brittle) than the parts from normal production (in ductile state). Our investigations revealed that, due to plastic deformation at room temperature, Nylon 6 presents an unusual phase transformation. There are similarities between austenitic stainless steel and Nylon 6. Thus, it consists in the fact that their γ forms transform into α forms, due to an applied heat treatment or at room temperature as a result of an applied pressure (plastic deformation). In both situations, material became harder and then less resistant to applied physico-mechanical actions. In this particular case, an unusual local material hardening was observed due to a combined influence of two processes (cooling process, torque test), with a failure of the molded parts.

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Section: Introduction *mentioning

confidence: 99%