Adaptation of Open Source 2D DIC Software Ncorr for Solid Mechanics Applications

This study focuses on establishing the utility of open source, MATLAB based 2D Digital Image Correlation (DIC) software Ncorr for solid mechanics applications. Various experiments like ring under diametral compression and beam under four point loading are conducted and corresponding displacement and strain fields are estimated using Ncorr. These results are compared with commercially available 2D DIC software Vic 2D from correlated solutions. The results generated from Ncorr are found to be in good agreement with its commercial counterpart Vic 2D

Progressive damage analysis of CFRP Laminate with circular cutouts under flexural loading

Application of a flexural or bending load on a Carbon fiber reinforced polymer(CFRP) specimen leads to both tensile and compressive stress state across the thickness of the specimen thereby resulting in a more complex damage behavior as the tensile and compressive failure modes of a composite material are different. Study of damage behavior of specimen includes location of damage initiation, damage propagation, various types damage modes and their interactions, prediction of damage initiation load and final failure load. Damage behavior of the CFRP specimen has to be studied for its efficient and sustainable design. In the present thesis, damage behavior of pristine CFRP specimen (without hole), specimen with both single circular hole and multiple circular holes having three different configurations (two hole longitudinal (2HL), two hole transverse (2HT) and two hole diagonal (2HD)) was studied both experimentally and numerically under four point flexural loading. The layup sequence of the CFRP specimen having Unidirectional (UD) [0]16 and Quasi-isotropic [−45/0/45/90]2s are studied. Two-dimensional Digital Image correlation(DIC) technique was employed for capturing the in-plane displacement and strains across the thickness of the specimen. Finite element (FE) based Progressive damage analysis(PDA) the CFRP specimen was performed. In the progressive damage model, Hashin’s failure criteria was implemented for the prediction of damage initiation of both fiber or matrix at a lamina level, material property degradation model was implemented for modelling damage evolution in the specimen and cohesive zone model was implemented for predicting the intiation and propagation of interlaminar delamination between layers of the specimen. Damage behavior of the specimen obtained from experiment was compared with the results obtained from PDM for validation. Additionally, the variation of load vs displacement, longitudinal strain distribution over the thickness face of the CFRP specimen obtained both experimentally and numerically were studied and the corresponding plots obtained from both were compared.Finally, the load carrying capacity of pristine specimen, specimen with single hole and specimen with multiple holes with three different configurations (2HL,2HT and 2HD) were compared and it was also seen which type of specimen according to the two lay up sequences which are unidirectional [0]16 and Quasi [−45/0/45/90]2s was more stiffer and stronge

Material Characterization of Carbon Fiber Reinforced Polymer Laminate Using Virtual Fields Method

Material Characterization of Carbon Fiber Reinforced Polymer Laminate Using Virtual Fields Metho

Implementation of MAD and Mean Absolute Deviation based Smoothing Algorithm for Displacement Data in Digital Image Correlation Technique

This study aims at obtaining smoothed strain fields from digital image correlation technique (DIC), by smoothing the displacement fields prior to strain computation. Both median absolute deviation (MAD) and mean absolute deviation based smoothing algorithms are implemented for data smoothing. On implementation of these algorithms, the noise levels in the strain fields are found to be reduced to a greater extent. For executing the whole field smoothing algorithm, an accurate boundary encoding algorithm is also developed

Report from Sundance TwentyTen: Religion in Independent Film

This is the report from the Sundance Film Festival 2010

Report from Sundance 2011: Religion in Independent Film

This is the report from the Sundance Film Festival 2011