Effect of Impact Velocity on Dynamic Response of Polymeric Foams

Gupta, Vijendra; Onwuka, Chizoba; Kidane, Addis

doi:10.1007/978-3-030-86562-7_13

Cited by 2 publications

(2 citation statements)

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“…[24] Based on these measurements, it is reasonable to assume the specimen deformation in the X direction could be predicted using a 1D model of an axially heterogeneous material, with the axial strain at each vertical position obtained by averaging the measured axial strains across the width of the specimen. [24,27] The recalculated average strain values across the width of specimen in the central region using 2D-DIC and the parameters in Table 1 for different load levels are shown in Figure 19. Though not shown in Figure 19, analysis of the strain data obtained along the entire length of the specimen demonstrated that the measured strains near the top and bottom boundaries of the sample were nearly zero for all load levels, primarily due to frictional interaction of the loading platen surfaces, resulting in a complex localised stress state and constrained local deformations.…”

Section: Discussion and Practical Implicationsmentioning

confidence: 99%

Section: Modulus Predictions With Experimental Datamentioning

confidence: 99%

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Direct material property determination: One‐dimensional formulation utilising full‐field deformation measurements

Rajan-Kattil

Sutton

Sockalingam

et al. 2022

Strain

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A direct approach is described to determine the elastic modulus distribution in a nominally heterogeneous material subject to tensile/compression loading and primarily experiencing deformations in the axial direction. The formulation is developed for uniaxial applications using basic theoretical constructs, resulting in a computational framework that has a matrix form [A] {E} = {R}, where the [A] matrix components are known functions of measured axial strains and axial positions, {R} components are known functions of axial body forces, applied loads and reactions and {E} components are the unknown elastic moduli at discrete locations along the length of the specimen. For a series of one‐dimensional (1D) material property identification procedure with known axial strains at discrete locations and various levels of random noise, results are presented to demonstrate the accuracy and noise sensitivity of the methodology. Finally, experimental measurements for a heterogeneous bone specimen are compared to our 1D model predictions, demonstrating that the predictions are in very good agreement with independent estimates at each load level of interest along the length of the bone specimen.

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Section: Discussion and Practical Implicationsmentioning

confidence: 99%

Section: Modulus Predictions With Experimental Datamentioning

confidence: 99%