Characterization and failure analysis of a polymeric clamp hanger component

Francis, Danny; Deang, J. F.; Florea, R.S.; Gaston, Derek; Lee, N.; Nouranian, Sasan; Permann, Cody; Rudd, Jonathan; Seely, Denver; Whittington, W.R.; Horstemeyer, M.F.

doi:10.1016/j.engfailanal.2012.07.020

Cited by 5 publications

(5 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These types of imperfections have been reported previously by other authors [2][3][4][5][6], generally related to the manufacturing process and the study of stress concentration points that cause a later fracture [7,12,13].…”

Section: Visual Inspectionsupporting

confidence: 70%

See 1 more Smart Citation

Failure analysis of a plastic modular belt in-service

Sánchez-Caballero

Sellès

Bou

et al. 2018

Engineering Failure Analysis

View full text Add to dashboard Cite

In this study, an analysis of the possible causes of the failure in-service of a section of a plastic modular belt was conducted. The study begins with a reproduction of the service conditions in a traction gear. An analysis of the fracture surfaces revealed the existence of defects in the interior of the parts. With the aim of determining the origin of the imperfections and their influence on the failure, an exhaustive mechanical and rheological characterization of the material was carried out. The development of an FE Analysis established that the reduction of the tensile strength of the part due to internal defects was around 70%. Tests also showed that the most stressed area was the area where the most defects appeared. A simulation of the injection process showed that the defects are caused by the geometry of the part, leading to the conclusion that its failure was caused by bad dimensioning of thicknesses.

show abstract

Section: Visual Inspectionsupporting

confidence: 70%

“…There are several studies focused on other materials. Vaxman et al [2], for example, worked on the void formation in thermoplastic composites; as well as Francis et al [3], but they studied the failure analysis of a clamp hanger.…”

Section: Introductionmentioning

confidence: 99%

Failure analysis of a plastic modular belt in-service

Sánchez-Caballero

Sellès

Bou

et al. 2018

Engineering Failure Analysis

View full text Add to dashboard Cite

show abstract

“…Voids form when the melt solidified without pressure and plastic at the surface is rigid enough to prevent retraction. The voids, being undetectable by visual observation, may exert the most detrimental effect on the mechanical performance of injection-moulded components, weakening their capacity to withstand the loads while in service and leading to crack initiation and failure [ 10 , 11 , 12 ]. The influence of the excessive shrinkage, in chunky plastic parts moulded from fiber reinforced composites, was highlighted as the main cause of the occurrence of voids and warpage by Kleindel et al [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

“…In what concerns unfilled thermoplastics, the shrinkage is even more unconstrained than for reinforced composites. The life span of polypropylene hanger was drastically reduced by the presence of the voids, caused by excessive uncontrolled shrinkage [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

“…However, concerning the pressure and thermally-induced residual stresses generated during injection moulding, none of these studies explicitly show their influence on the prediction of the structural performance. An exception was an approach used by Francis et al [ 12 ], which emphasized the concentration of von Mises stress in the vicinity of the internal voids, explicitly modelled with the finite element mesh, according to the data obtained from destructive testing.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Computer-Aided Reengineering towards Plastic Part Failure Minimization

et al. 2021

View full text Add to dashboard Cite

The work reported here intends to identify and mitigate the causes for failure in a plastic faucet holder, a part of an integral float faucet with a well-documented history of fracture occurrence. A methodology for the identification of hidden internal defects in plastic parts and the elaboration of the required corrective actions towards quality improvement is, therefore, presented. Firstly, part defects were identified via injection moulding process numerical simulation. The latter has enabled the prediction of an excessive volumetric shrinkage at the core of the faucet holder, highlighting the presence of internal voids and, hence, the possible deterioration of the load-bearing capacity. The supposition was later confirmed by X-ray topography scans. Part reengineering, consisting of localized thickness reduction, was the option chosen for decreasing the high shrinkage at the core. For validation purposes, structural analyses were carried out, with and without accounting for the injection moulding processing history. The results obtained during part structural analysis have enabled us to conclude that, when taking into account the residual stresses generated during injection moulding, the analysis more closely reflects the experimental data and allows us to implicitly envisage the propensity to fracture. Moreover, the part modifications, undertaken during the faucet holder reengineering, led to the reduction of the cumulative (processing and imposed by load) stresses by 50%, when compared to the original design analysed.

show abstract