Statistical Properties on Mechanical Strength of Glass for Cathode Ray Tubes.

Ohsugi, Shigeo; Yoshioka, Shoji; Miyazaki, Masayuki; Itoh, Junko; Tani, Shuichi; Nakamura, Koji; Hijikata, Akemi

doi:10.2472/jsms.47.1071

Cited by 1 publication

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“…It is not an inherent material property. Handling changes the surface structure by introducing scratches, dents, etc [1,2]. Strength can also be sample size dependent.…”

Section: Introductionmentioning

confidence: 99%

Decoupling Strength and Grid Resolution in Peridynamic Theory

Stewart

Jeon

2019

J Peridyn Nonlocal Model

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The primary mechanism of damage evolution of brittle materials in peridynamic theory is based on individual pair-wise bond strain. A critical value for bond strain is derived based on linear elastic fracture mechanic theory. It is a function of the horizon, the radius of non-locality of the material. The horizon must be larger than the material point spacing but not too large which would significantly slow the simulation. Typical sizes used for the horizon range between three and six times the material point spacing, if a constant multiple is used it could be said that the critical strain is a function of the model's material point grid resolution. This critical strain function ensures that the fracture toughness is independent of the horizon and grid resolution. This works well when modeled materials have pre-existing cracks. However, since the peridynamic fracture toughness manifests as a critical strain it imposes an artificial strength onto the modeled material that may not represent the real strength of the material. When the material strength is less than the model's critical strain certain flaw insertion methods can be used to capture the strength behavior. However, if the material strength is larger than the critical strain then the flaw size that represents that strength is too small to model. To address this discrepancy, multi-resolution models have been previously used, having differently sized horizons, such that the region that is expected to nucleate failure is represented correctly while the bulk material is modeled with a coarser grid and larger horizon. Such a multiscale approach could be designed from the beginning of the simulation or exhibit adaptive refinement during crack propagation. Such multiscale approaches add significant complexity to the simulation framework and fundamental model descriptions. This paper introduces a method that is able to decouple the model strength from the horizon and grid resolution by using a refinement overlay technique. This overlay is virtual and does not change the explicit material resolution as adaptive techniques do.

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“…It is not an inherent material property. Handling changes the surface structure by introducing scratches, dents, etc [1,2]. Strength can also be sample size dependent.…”

Section: Introductionmentioning

confidence: 99%

Decoupling Strength and Grid Resolution in Peridynamic Theory

Stewart

Jeon

2019

J Peridyn Nonlocal Model

View full text Add to dashboard Cite

show abstract

Statistical Properties on Mechanical Strength of Glass for Cathode Ray Tubes.

Cited by 1 publication

References 0 publications

Decoupling Strength and Grid Resolution in Peridynamic Theory

Decoupling Strength and Grid Resolution in Peridynamic Theory

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