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Evaluation of the effect of the specimen image resolution on non-uniform displacement accuracy of 2D-digital image correlation
Jaya A.S.a, Dirgantara T.a, Putra I.S.a
a Lightweight Structures Research Group, Faculty of Mechanical and Aerospace Engineering, Institut Teknologi Bandung, Indonesia
[vc_row][vc_column][vc_row_inner][vc_column_inner][vc_separator css=”.vc_custom_1624529070653{padding-top: 30px !important;padding-bottom: 30px !important;}”][/vc_column_inner][/vc_row_inner][vc_row_inner layout=”boxed”][vc_column_inner width=”3/4″ css=”.vc_custom_1624695412187{border-right-width: 1px !important;border-right-color: #dddddd !important;border-right-style: solid !important;border-radius: 1px !important;}”][vc_empty_space][megatron_heading title=”Abstract” size=”size-sm” text_align=”text-left”][vc_column_text]© 2006-2016 Asian Research Publishing Network (ARPN).The enhancement of the accuracy in a 2D-DIC can be related to the image resolution. In a common sense, higher image resolution provides a better result than lower image resolution. However, it is expensive to produce a high resolution images and in many cases they are not necessary. On the other side, measurement accuracy by using DIC is related with the displacement field. In many cases on experimental mechanics, displacement field in an area of interest is usually nonuniform, in which the ratio between minimum and maximum displacement in that area of interest is high. The present work evaluates the accuracy of 2D-DIC algorithms in relation with image resolution and the effect of non-uniformity of the displacement. The evaluation was based on the input images of the algorithms, which were artificial and experimental images. It was observed that both type of input images produce the similar tendency on the effect of image resolution to the accuracy of the measurement. Higher image resolution reduced relative error significantly in case where the minimum displacement in the area of interest is much smaller than the maximum displacement (very low ratio or high nonuniformity of the displacement). However, even though lower resolution image has higher relative error than high resolution image, the effect of resolution is not significant if displacement field tends to be more uniform (the ratio between minimum and maximum displacement in an area of interest is higher than 0.5). The importance of the present result is to determine the applicability of DIC measurement field based on image resolution.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Author keywords” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Indexed keywords” size=”size-sm” text_align=”text-left”][vc_column_text]2D-DIC,Accuracy,Displacement,Resolution,Sub-pixel[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Funding details” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”DOI” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][/vc_column_inner][vc_column_inner width=”1/4″][vc_column_text]Widget Plumx[/vc_column_text][/vc_column_inner][/vc_row_inner][/vc_column][/vc_row][vc_row][vc_column][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][/vc_column][/vc_row]