On the ability of the notch fracture mechanics in predicting the last-ply-failure of blunt V-notched laminated composite specimens: A hard problem can be easily solved by conventional methods

Torabi, A.R.; Pirhadi, E.

doi:10.1016/j.engfracmech.2019.106534

Cited by 21 publications

(27 citation statements)

References 52 publications

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“…Furthermore, the deformation of the bolts was disregarded and they were modeled as rigid bodies since they were made from high-strength steel and, accordingly, their stiffness was one order of magnitude higher than that of the spruce wood. Finally, although the spruce wood is orthotropic in nature, it was modeled as a homogeneous and isotropic material with linear elastic behavior, thanks to the application of the Virtual Isotropic Material Concept (VIMC) [ 30 , 31 , 32 , 33 , 34 , 35 ].…”

Section: Methodsmentioning

confidence: 99%

“…During the last few decades, different approaches have been developed for the fracture analysis of isotropic engineering materials weakened by notches, such as stress/strain-based models, the cohesive zone model (CZM), finite fracture mechanics (FFM), and some others. Recently, some of these approaches have also been utilized for the last-ply-failure prediction of polymer matrix composites (PMCs), which are actually categorized as orthotropic materials [ 30 , 31 , 32 , 33 , 34 , 35 ]. The use of failure criteria of isotropic materials for the critical load prediction of orthotropic materials has been applied by equating the real orthotropic material with a virtual isotropic material using the Virtual Isotropic Material Concept (VIMC) [ 30 , 31 , 32 , 33 , 34 , 35 ].…”

Section: Methodsmentioning

confidence: 99%

“…Meneghetti et al [ 30 ] generalized the SED criterion to mode I/III loading conditions. Other approaches such as stress-based models, finite fracture mechanics (FFM), and the Virtual Isotropic Material Concept (VIMC) have also been utilized [ 31 , 32 , 33 , 34 , 35 , 36 ].…”

Section: Introductionmentioning

confidence: 99%

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Tensile-Tearing Fracture Analysis of U-Notched Spruce Samples

et al. 2022

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Spruce wood (Picea Mariana) is a highly orthotropic material whose fracture behavior in the presence of U-shaped notches and under combined tensile-tearing loading (so-called mixed-mode I/III loading) is analyzed in this work. Thus, several tests are carried out on U-notched samples with different notch tip radii (1 mm, 2 mm, and 4 mm) under various combinations of loading modes I and III (pure mode I, pure mode III, and three mixed-mode I/III loadings), from which both the experimental fracture loads and the fracture angles of the specimens are obtained. Because of the linear elastic behavior of the spruce wood, the point stress (PS) and mean stress (MS) methods, both being stress-based criteria, are used in combination with the Virtual Isotropic Material Concept (VIMC) for predicting the fracture loads and the fracture angles. By employing the VIMC, the spruce wood as an orthotropic material is modeled as a homogeneous and isotropic material with linear elastic behavior. The stress components required for calculating the experimental values of notch stress intensity factors are obtained by finite element (FE) analyses of the test configuration using commercial FE software from the fracture loads obtained experimentally. The discrepancies between the experimental and theoretical results of the critical notch stress intensity factors are obtained between −12.1% and −15% for the PS criterion and between −5.9% and −14.6% for the MS criterion, respectively. The discrepancies related to fracture initiation angle range from −1.0% to +12.1% for the PS criterion and from +1.5% to +12.2% for the MS criterion, respectively. Thus, both the PS and MS models have good accuracy when compared with the experimental data. It is also found that both failure criteria underestimate the fracture resistance of spruce wood under mixed-mode I/III loading.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Tensile-Tearing Fracture Analysis of U-Notched Spruce Samples

et al. 2022

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“…It was determined that a single pair of mid-plane 90 plies is optimal, because the inclusion of multiple pairs leads to extensive matrix cracking prior to delamination with inaccurate measurements. 30,31 The NASA study indicates that the EDT test provides a suitable test method with a simple loading mechanism, avoids the necessity of measuring the size of delamination, and provides an objective method of comparing interlinear fractures. [23][24][25] All of these characteristics make the EDT an ideal methodology for a comparative evaluation of the effectiveness of edge treatments in mitigating out-of-plane stress and delamination and edge effect behavior.…”

Section: Standard Mechanical Tests and Inspection Of Composite Laminatesmentioning

confidence: 99%

Mitigations of machine-damaged free-edge effects on fiber-reinforced composites

Brauning

Arifa

Alarifi

et al. 2020

Journal of Composite Materials

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The carbon fiber-reinforced composites were prepared in a vacuum oven using pre-preg composites, and the edge surfaces of the composite coupons were treated using high performing adhesives to eliminate the free-edge effects. The primary objective of the study was to usefully address the free-edge effects of composites used in aircraft and other manufacturing industries. The mechanical test results conducted on the untreated and edge-treated test coupons showed that the edge treatment and fiber orientations significantly affected the tensile strength and quality of the composites. It is determined that applying adhesives on the edges of the coupons could improve the mechanical properties of the composites, about 11%. Successful testing and evaluation of materials can lead to the precise analysis of a structure, and predictable behavior of the end design. This study may open up new possibilities to enhance the overall mechanical properties of fiber-reinforced composites for various manufacturing industries.

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“…Recently, Torabi and Pirhadi developed a novel method to simplify the analysis of laminated composites, the so-called Virtual Isotropic Material Concept (VIMC). The authors successfully applied the VIMC on glass/epoxy-notched laminated composites containing U-and V-notches, in combination with two well-known brittle stress criteria: the maximum tangential stress (MTS) criterion and the mean stress (MS) criterion, to predict the last-ply failure (LPF) loads under both mode I and mixed-mode I/II loadings [19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Critical Load Prediction in Notched E/Glass–Epoxy-Laminated Composites Using the Virtual Isotropic Material Concept Combined with the Average Strain Energy Density Criterion

et al. 2021

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This paper attempts to validate the application of the Virtual Isotropic Material Concept (VIMC) in combination with the average strain energy density (ASED) criterion to predict the critical load in notched laminated composites. This methodology was applied to E/glass–epoxy-laminated composites containing U-notches. For this purpose, a series of fracture test data recently published in the literature on specimens with different notch tip radii, lay-up configurations, and a number of plies were employed. It was shown that the VIMC–ASED combined approach provided satisfactory predictions of the last-ply failure (LPF) loads (i.e., critical loads).

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On the ability of the notch fracture mechanics in predicting the last-ply-failure of blunt V-notched laminated composite specimens: A hard problem can be easily solved by conventional methods

Cited by 21 publications

References 52 publications

Tensile-Tearing Fracture Analysis of U-Notched Spruce Samples

Tensile-Tearing Fracture Analysis of U-Notched Spruce Samples

Mitigations of machine-damaged free-edge effects on fiber-reinforced composites

Critical Load Prediction in Notched E/Glass–Epoxy-Laminated Composites Using the Virtual Isotropic Material Concept Combined with the Average Strain Energy Density Criterion

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