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51315-5856-Effect of High Arm Displacement on DCB Specimen Testing

Picture for Effect of High Arm Displacement on DCB Specimen Testing
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Product Number: 51315-5856-SG
ISBN: 5856 2015 CP
Author: Sebastian Cravero
Publication Date: 2015
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$20.00
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Usually double cantilever beam (DCB) samples are tested following NACE Standard TM0177-2005 procedure. The standard establishes arm displacement limits as a function of steel grade.Material resistance to propagation of environmental cracks is expressed in terms of a critical stress intensity factor KISSC or K-limit values. However the increasing interest on material characterization in mild sour media imposes testing at higher arm displacements that can produce larger plastic zones at the crack-tip of DCB specimens. Therefore It is important to study the loading conditions that cause the loss of linear elastic response in DCB samples.In the present paper several elastic-plastic and linear elastic 3D finite element models of DCB geometry have been performed. The models consider a wide range of crack lengths to half specimens height (a/h) ratios and different material properties (different YS levels). The obtained results allow to correct the fracture mechanics parameters (Ks) of DCB samples due to elastic-plastic effects and to establish a criterion to determine the range of applicability of linear elastic fracture mechanics.
Usually double cantilever beam (DCB) samples are tested following NACE Standard TM0177-2005 procedure. The standard establishes arm displacement limits as a function of steel grade.Material resistance to propagation of environmental cracks is expressed in terms of a critical stress intensity factor KISSC or K-limit values. However the increasing interest on material characterization in mild sour media imposes testing at higher arm displacements that can produce larger plastic zones at the crack-tip of DCB specimens. Therefore It is important to study the loading conditions that cause the loss of linear elastic response in DCB samples.In the present paper several elastic-plastic and linear elastic 3D finite element models of DCB geometry have been performed. The models consider a wide range of crack lengths to half specimens height (a/h) ratios and different material properties (different YS levels). The obtained results allow to correct the fracture mechanics parameters (Ks) of DCB samples due to elastic-plastic effects and to establish a criterion to determine the range of applicability of linear elastic fracture mechanics.
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