Stepwise fatigue crack propagation in polyethylene resins of different molecular structure

Nanomodification of Polyethylene via Focused Electron Beam Irradiation: Controlled Crazing and Application to Crack Arresting

“…[ 58 ] A detailed analysis of the magnified image in Figure 6B reveals the intricate interaction between FEB irradiation and crack propagation, highlighting the microstructural changes that reduce susceptibility to fracture. These findings are consistent with existing literature [ 59–66 ] and suggest that FEB irradiation contributes to improved material resilience by altering the internal PE structure. FEB‐induced crack arrest, it is proposed that this behavior arises from a combination of nanoscale crosslinking, chain scission, and localized densification of the polymer matrix.…”

“…[ 37,40–42 ] Specifically, crack tip blunting reduces local surface stress concentration, while crack path deviation enhances energy dissipation, both contributing to improved fatigue resistance. [ 61–66 ] Overall, the observed transition in surface crack morphology from brittle to ductile is consistent with fracture mechanics theory, [ 67–69,70–75,76 ] where enhanced plasticity around crack tips promotes crack arrest. The combination of increased surface roughness, ductile features, and non‐linear crack paths suggests that FEB irradiation enhances fatigue resistance by promoting localized crack arrest and interrupting crack continuity under cyclic loading.…”

Effect of molecular structure on seal ability, flex crack and mechanical properties of linear low-density polyethylene films

“…5 The presence of these flexible interlamellar tie chains contributes to energy absorption during flexing and hinders crack initiation and propagation. The effect of SCB distribution on crack propagation and fracture toughness of polyethylene has also been investigated by Shah et al 18 They reported that superior fracture toughness can be achieved by distributing the short-chain branches on high molecular weight chains. They confirmed the results by performing fatigue tests.…”

Application of single site catalyst metallocene polyethylenes in extruded films: Effect of molecular structure on sealability, flexural cracking and mechanical properties

“…The presence of these flexible interlamellar tie chains contribute to energy absorption of the material during flexing and hinders crack initiation and propagation. The effect of SCB distribution on crack propagation and fracture toughness of polyethylene has been also investigated by Shah et al They reported that superior fracture toughness can be achieved by distributing the short chain branches on high molecular weight chains. They confirmed the results by performing fatigue tests.…”