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<p>This paper, the first in a two part series, investigates the capabilities of high speed linescan extensometry for dynamic strain analysis in mechanical testing environments. Through a series of experimental setups, this study evaluates the accuracy and reliability of the linescan extensometer in capturing strain data under varying conditions and compares its performance with traditional strain measurements techniques such as 2D Digital Image Correlation (DIC) and 1D wave theory calculations. Additionally, quasi-static rate tests were performed to assess the agreement between 1D (linescan extensometer), 2D DIC, and 3D DIC methods under low strain rate conditions. Experiments were conducted at multiple testing facilities, including Mississippi State University and Standard Mechanics LLC, utilizing a range of materials from polymers to metals under both tensile and compressive forces. The results confirm that the linescan exten- someter provides a viable and often superior alternative for recording dynamic strain, offering substantial benefits in terms of resolution and speed compared to established methods. This paper lays the groundwork for the subsequent statis- tical analysis in Part II, aimed at further evaluating these experimental findings through computational models.</p>

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Evaluating High Speed Linescan Extensometer for Dynamic Strain Analysis in Diverse Materials, Part I - Method Introduction

  • 期刊论文

  • 发表日期：

    2025年9月8日

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  • L. Zhang,
  • R. Leonard III,
  • J. Bennett,
  • M. Jarachi,
  • C. Hall,
  • W. Whittington

摘要

This paper, the first in a two part series, investigates the capabilities of high speed linescan extensometry for dynamic strain analysis in mechanical testing environments. Through a series of experimental setups, this study evaluates the accuracy and reliability of the linescan extensometer in capturing strain data under varying conditions and compares its performance with traditional strain measurements techniques such as 2D Digital Image Correlation (DIC) and 1D wave theory calculations. Additionally, quasi-static rate tests were performed to assess the agreement between 1D (linescan extensometer), 2D DIC, and 3D DIC methods under low strain rate conditions. Experiments were conducted at multiple testing facilities, including Mississippi State University and Standard Mechanics LLC, utilizing a range of materials from polymers to metals under both tensile and compressive forces. The results confirm that the linescan exten- someter provides a viable and often superior alternative for recording dynamic strain, offering substantial benefits in terms of resolution and speed compared to established methods. This paper lays the groundwork for the subsequent statis- tical analysis in Part II, aimed at further evaluating these experimental findings through computational models.