A Hybrid Experimental-Numerical Study of Crack Initiation and Growth in Transparent Bilayers Across a Weak Interface

Dondeti, S.; Tippur, Hareesh V.

doi:10.1007/978-3-319-95089-1_7

Cited by 3 publications

(3 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…After branching, the cracks first grow along the interface and then change direction and penetrate into the second PMMA layer. In the results in [6] simulated using cohesive elements, the interface is damaged but penetration into the second PMMA layer does not happen. The nonlocal PD model captures an enlargement of the fracture process zone (see Figure 17) just before the main crack reaches the interface and branches, and once again when the crack traveling along the interface changes direction and penetrates into the second PMMA layer.…”

Section: Simulation Results On the Influence Of Interface Locationmentioning

confidence: 99%

“…This approach leads to mass loss and has convergence difficulties as the mesh size goes to zero [4]. Cohesive elements need to be predefined along the crack path, which is not known in advance, especially in dynamic fracture problems ( [5], [6]). Nonlocal models have been recently shown to correctly predict dynamic brittle fracture behavior in homogeneous materials, including crack branching (see e.g.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Interfaces in Dynamic Brittle Fracture of PMMA: a peridynamic analysis

Wang

Mehrmashhadi

Bobaru

2023

Preprint

View full text Add to dashboard Cite

Recent experiments in bonded PMMA layers have shown dramatic changes in dynamic crack growth characteristics depending on the interface location and toughness. In this paper we present a peridynamic (PD) analysis of this phenomenon and determine three elements that are essential in a model reproducing the observed fracture behavior: (1) softening near the crack tip to account for changes in PMMA due to heat-generation induced by the high strain rates reached around the crack tip in dynamic fracture; (2) independent extension (mode I) and shear (mode II) modes of fracture; (3) a two-parameter fracture model, which matches both strength and fracture toughness for any horizon size. Once these elements are in place, the PD model captures the experimentally observed dynamic fracture characteristics in bi-layer PMMA: crack branching or not at the interface, depending on the interface location; crack running along the interface for a while before punching through the second PMMA layer; slight crack path oscillations near the far end of the sample. The computed crack speed profiles are close to those measured experimentally. The model produces an enlargement of the fracture process zone when the crack running along the interface penetrates into the second PMMA layer, as observed in the experiments. This is where nonlocality of the PD model becomes relevant and critical.

show abstract

Section: Simulation Results On the Influence Of Interface Locationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Interfaces in Dynamic Brittle Fracture of PMMA: a peridynamic analysis

Wang

Mehrmashhadi

Bobaru

2023

Preprint

View full text Add to dashboard Cite

show abstract

“…10). Keeping the load relatively constant for a duration of about 60 μs after crack initiation seems a good choice (see the behavior reported in a similar experiment in [29]). We investigate two possible unloading paths (see Fig.…”

Section: Convergence Study For Dynamic Fracture Pmmamentioning

confidence: 99%

Uncovering the dynamic fracture behavior of PMMA

Mehrmashhadi¹,

Wang²,

Bobaru³

2019

Preprint

View full text Add to dashboard Cite

Experimental investigations of dynamic crack propagation in PMMA induced by impact show single cracks running at around 300-400 m/s. Existing numerical models for simulating dynamic fracture in PMMA consistently produce crack propagation speeds significantly higher than those measured experimentally. Here we uncover the reason for this puzzle by showing that localized softening in the fracture process zone (caused by heating due to high strain rates in front of the crack tip), leads to crack propagation speeds that match the observed ones. We introduce a new constitutive model in our peridynamic formulation for PMMA to account for material softening in the crack tip region. With the new model, the computed crack speed and crack length evolution match very closely those found experimentally.

show abstract