Ductile failure analysis of epoxy resin plates containing multiple circular arc cracks by means of the equivalent material concept

AbstractDuctile failure of polymeric samples weakened by circular arc cracks is studied theoretically and experimentally in this research. Various arrangements of cracks with different arc angles are considered in the specimens such that crack tips experienced the mixed mode I/II loading conditions. Fracture tests are conducted on the multi-cracked specimens and their fracture loads are achieved. To provide the results, the equivalent material concept (EMC) is used in conjunction of dislocation method and a brittle fracture criterion such that there is no necessity for performing complex and time-consuming elastic-plastic damage analyses. Theoretical and experimental stress intensity factors are computed and compared with each other by employing the fracture curves which demonstrate the appropriate efficiency of proposed method to predict the tests results.

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On the Ability of the Equivalent Material Concept in Predicting Ductile Failure of U-Notches under Moderate- and Large-Scale Yielding Conditions

Physical Mesomechanics ◽

10.1134/s1029959915040062 ◽

2015 ◽

Vol 18 (4) ◽

pp. 337-347 ◽

Cited By ~ 27

Author(s):

A. R. Torabi ◽

R. Habibi ◽

B. Mohammad Hosseini

Keyword(s):

Large Scale ◽

Ductile Failure ◽

Equivalent Material ◽

Equivalent Material Concept ◽

Scale Yielding ◽

Material Concept

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Ductile Failure Prediction of U-Notched Bainitic Functionally Graded Steel Specimens Using the Equivalent Material Concept Combined with the Averaged Strain Energy Density Criterion

Physical Mesomechanics ◽

10.1134/s102995991903010x ◽

2019 ◽

Vol 22 (3) ◽

pp. 255-260 ◽

Cited By ~ 1

Author(s):

H. Salavati ◽

H. Mohammadi

Keyword(s):

Energy Density ◽

Strain Energy Density ◽

Strain Energy ◽

Ductile Failure ◽

Failure Prediction ◽

Functionally Graded ◽

Equivalent Material ◽

Functionally Graded Steel ◽

Equivalent Material Concept ◽

Material Concept

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Extension of the Equivalent Material Concept to Compressive Loading: Combination with LEFM Criteria for Fracture Prediction of Keyhole Notched Polymeric Samples

Applied Sciences ◽

10.3390/app11094138 ◽

2021 ◽

Vol 11 (9) ◽

pp. 4138

Author(s):

Ali Reza Torabi ◽

Kazem Hamidi ◽

Behnam Shahbazian ◽

Sergio Cicero ◽

Filippo Berto

Keyword(s):

Compressive Loading ◽

General Purpose ◽

Equivalent Material ◽

Notched Specimens ◽

Compressive Stresses ◽

Equivalent Material Concept ◽

Load Carrying ◽

The Mean ◽

Polymeric Samples ◽

Material Concept

This work analyzes, both theoretically and experimentally, the fracture process of square specimens weakened by keyhole notches and subjected to compressive stresses. Two materials are covered: general-purpose polystyrene (GPPS) and poly(methyl methacrylate) (PMMA). Firstly, the load-carrying capacity (LCC) of the specimens is determined experimentally. Then, by using the equivalent material concept (EMC) for compressive conditions coupled with the maximum tangential stress (MTS) and the mean stress (MS) criteria, the LCC of the notched specimens is predicted. The results show that by using the approach proposed in the present investigation, not only can the critical loads in the keyhole notched polymeric specimens be precisely predicted, but also the corresponding compressive critical stress of the two mentioned polymers can be successfully estimated.

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