Crack length correction and root rotation angle in a sandwich single cantilever beam (SCB) fracture specimen
Crack root rotation is a measure of deviation from clamped boundary conditions of region in front of the crack tip. The root rotation depends on the shear force and bending moment acting at the crack tip. Such rotation significantly affects the compliance and energy-release rate. Crack root rotation...
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KeAi Communications Co., Ltd.
2020-12-01
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doaj-59a56562cdc943098eb80fa808946c662020-11-25T03:02:05ZengKeAi Communications Co., Ltd.International Journal of Lightweight Materials and Manufacture2588-84042020-12-0134426434Crack length correction and root rotation angle in a sandwich single cantilever beam (SCB) fracture specimenVishnu Saseendran0Leif A. Carlsson1Christian Berggreen2Waruna Seneviratne3National Institute for Aviation Research (NIAR), Wichita State University, 1845 Fairmount Street, Wichita, KS, 67260, USA; Corresponding author.Department of Ocean & Mechanical Engineering, Florida Atlantic University, 777 Glades Road, Boca Raton, FL, 33431, USADepartment of Mechanical Engineering, Technical University of Denmark, Nils Koppels Allé, Kgs. Lyngby, 2800, DenmarkNational Institute for Aviation Research (NIAR), Wichita State University, 1845 Fairmount Street, Wichita, KS, 67260, USACrack root rotation is a measure of deviation from clamped boundary conditions of region in front of the crack tip. The root rotation depends on the shear force and bending moment acting at the crack tip. Such rotation significantly affects the compliance and energy-release rate. Crack root rotation analysis of Single Cantilever Beam (SCB) sandwich specimens is presented here. Closed-form solutions for the root rotation angle obtained from the foundation analysis are compared to finite element analysis (FEA) predictions. The derived expressions closely match for a range of sandwich configurations. An expression for the energy-release rate, derived from the foundation analysis was found to agree with FEA predictions over a large range of face-to-core modulus ratios. Energy-release rate and mode mixity phase angle increased with decreasing crack length due to the transverse shear effects. At longer crack lengths, both energy-release rate and phase angle reached a value independent of crack length. The foundation model is used to derive a simple expression for the offset crack length for the SCB sandwich fracture test. It is shown that the obtained formulation agrees closely well with both numerical and experimental values. In addition, SCB fracture tests performed using an in-house built translatable rig showed close relation to both analytical and numerical compliance results.http://www.sciencedirect.com/science/article/pii/S2588840420300421SandwichCompositesRoot rotationFace sheet/core interfacePhase angleMBT |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Vishnu Saseendran Leif A. Carlsson Christian Berggreen Waruna Seneviratne |
spellingShingle |
Vishnu Saseendran Leif A. Carlsson Christian Berggreen Waruna Seneviratne Crack length correction and root rotation angle in a sandwich single cantilever beam (SCB) fracture specimen International Journal of Lightweight Materials and Manufacture Sandwich Composites Root rotation Face sheet/core interface Phase angle MBT |
author_facet |
Vishnu Saseendran Leif A. Carlsson Christian Berggreen Waruna Seneviratne |
author_sort |
Vishnu Saseendran |
title |
Crack length correction and root rotation angle in a sandwich single cantilever beam (SCB) fracture specimen |
title_short |
Crack length correction and root rotation angle in a sandwich single cantilever beam (SCB) fracture specimen |
title_full |
Crack length correction and root rotation angle in a sandwich single cantilever beam (SCB) fracture specimen |
title_fullStr |
Crack length correction and root rotation angle in a sandwich single cantilever beam (SCB) fracture specimen |
title_full_unstemmed |
Crack length correction and root rotation angle in a sandwich single cantilever beam (SCB) fracture specimen |
title_sort |
crack length correction and root rotation angle in a sandwich single cantilever beam (scb) fracture specimen |
publisher |
KeAi Communications Co., Ltd. |
series |
International Journal of Lightweight Materials and Manufacture |
issn |
2588-8404 |
publishDate |
2020-12-01 |
description |
Crack root rotation is a measure of deviation from clamped boundary conditions of region in front of the crack tip. The root rotation depends on the shear force and bending moment acting at the crack tip. Such rotation significantly affects the compliance and energy-release rate. Crack root rotation analysis of Single Cantilever Beam (SCB) sandwich specimens is presented here. Closed-form solutions for the root rotation angle obtained from the foundation analysis are compared to finite element analysis (FEA) predictions. The derived expressions closely match for a range of sandwich configurations. An expression for the energy-release rate, derived from the foundation analysis was found to agree with FEA predictions over a large range of face-to-core modulus ratios. Energy-release rate and mode mixity phase angle increased with decreasing crack length due to the transverse shear effects. At longer crack lengths, both energy-release rate and phase angle reached a value independent of crack length. The foundation model is used to derive a simple expression for the offset crack length for the SCB sandwich fracture test. It is shown that the obtained formulation agrees closely well with both numerical and experimental values. In addition, SCB fracture tests performed using an in-house built translatable rig showed close relation to both analytical and numerical compliance results. |
topic |
Sandwich Composites Root rotation Face sheet/core interface Phase angle MBT |
url |
http://www.sciencedirect.com/science/article/pii/S2588840420300421 |
work_keys_str_mv |
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