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<p>Employing Digital Image Correlation (DIC) and LS-DYNA numerical simulation, this study examines the evolution of the dynamic strain field and damage distribution in media subjected to eccentric uncoupled column charges. The main innovations and findings are as follows: (1) eccentric charging leads to distinct spatiotemporal asymmetry in strain propagation. The eccentric side exhibits earlier and stronger strain responses, along with a higher von Mises strain attenuation index that is less sensitive to the decoupling coefficient. In contrast, the non-eccentric side shows delayed and weaker responses, and its attenuation index decreases as the decoupling coefficient increases. (2) Damage distribution demonstrates clear fractal characteristics and pronounced asymmetry. The eccentric side develops a larger damage zone, a more complex crack network, and a higher fractal dimension, whereas damage on the non-eccentric side remains limited and is further suppressed with an increase in the decoupling coefficient. (3) Stress attenuation behavior differs significantly between the two sides. The attenuation index remains consistently high on the eccentric side, while on the non-eccentric side it is lower and declines with increasing decoupling coefficient. These findings provide important theoretical and practical insights for understanding blast mechanisms in eccentric charge structures and for optimizing contour-controlled blasting parameters.</p>

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Strain field and damage distribution in column charge with eccentric structure using digital image correlation

  • 期刊论文

  • 发表日期：

    2026年5月23日

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  • Junji Lu,
  • Qingfu Zeng,
  • Xiaobing Yan,
  • Jinjing Zuo,
  • Dayang Yan,
  • Yong Zhao

摘要

Employing Digital Image Correlation (DIC) and LS-DYNA numerical simulation, this study examines the evolution of the dynamic strain field and damage distribution in media subjected to eccentric uncoupled column charges. The main innovations and findings are as follows: (1) eccentric charging leads to distinct spatiotemporal asymmetry in strain propagation. The eccentric side exhibits earlier and stronger strain responses, along with a higher von Mises strain attenuation index that is less sensitive to the decoupling coefficient. In contrast, the non-eccentric side shows delayed and weaker responses, and its attenuation index decreases as the decoupling coefficient increases. (2) Damage distribution demonstrates clear fractal characteristics and pronounced asymmetry. The eccentric side develops a larger damage zone, a more complex crack network, and a higher fractal dimension, whereas damage on the non-eccentric side remains limited and is further suppressed with an increase in the decoupling coefficient. (3) Stress attenuation behavior differs significantly between the two sides. The attenuation index remains consistently high on the eccentric side, while on the non-eccentric side it is lower and declines with increasing decoupling coefficient. These findings provide important theoretical and practical insights for understanding blast mechanisms in eccentric charge structures and for optimizing contour-controlled blasting parameters.