Standardized Compliance Matrices for General Anisotropic Materials and a Simple Measure of Anisotropy Degree Based on Shear-Extension Coupling Coefficient

Zhao, Jing; Song, Xiaozeng; Liu, Bin

doi:10.1142/s1758825116500769

Cited by 9 publications

(2 citation statements)

References 25 publications

(31 reference statements)

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“…The required coefficients of the elastic compliance matrix are procured from several experimental studies [27,30,32,35,36]. And the basic properties of the utilized PVDF material are given in Table 1.…”

Section: General Informationmentioning

confidence: 99%

Transparent Localized Haptics: Utilization of PVDF-Type Piezoelectric Actuators on Touch-Displays

Ege¹,

Birbilen²,

Balıkçı³

2023

Preprint

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Generating localized haptic feedback on touch displays has been a challenge in recent years. In this study, we introduce a haptic interface using transparent thin-film PVDF actuators to address this issue. The transparency feature allows for mounting the actuators at any location beneath the display, enabling localized haptic feedback as the generated vibration is primarily evident on the mounting area. Two different configurations are designed, simulated and prepared to explore the effectiveness of the proposed approach. The first configuration is used to characterize the haptic interface. Modal and forced-vibration analysis are performed to identify important design characteristics based on human factor considerations. Subsequent 2AFC psychophysics experiments validate the characteristics. In the second configuration, eight actuators are attached to the touch surface in a 2x4 matrix formation and excited at different voltage amplitudes. Human experiments are conducted based on the results from corresponding forced-vibration analysis. The results show that subjects demonstrate an accuracy of 96% in identifying locations with haptic feedback when the actuators are excited with 232 Vpp. Overall, our study demonstrates the effectiveness of the haptic interface equipped with PVDF-type actuators in achieving localized haptic feedback on touch displays.

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Section: General Informationmentioning

confidence: 99%

Transparent Localized Haptics: Utilization of PVDF-Type Piezoelectric Actuators on Touch-Displays

Ege¹,

Birbilen²,

Balıkçı³

2023

Preprint

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show abstract

“…The compliance matrix is then rotated based on a stress and strain rotation matrix at each element, as in Ref. 28. Stiffness in the circumferential and radial directions is extracted from the resulting rotated compliance matrix at each element to obtain stiffness maps in the circumferential and radial directions, with directions represented in Fig.…”

Section: Beimmentioning

confidence: 99%

Reproducibility assessment of a biomechanical model-based elasticity imaging method for identifying changes in left ventricular mechanical stiffness

et al. 2022

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. Purpose Cardiotoxicity of antineoplastic therapies is increasingly a risk to cancer patients treated with curative intent with years of life to protect. Studies highlight the importance of identifying early cardiac decline in cancer patients undergoing cardiotoxic therapies. Accurate tools to study this are a critical clinical need. Current and emerging methods for assessing cardiotoxicity are too coarse for identifying preclinical cardiac degradation or too cumbersome for clinical implementation. Approach In the previous work, we developed a noninvasive biomechanical model-based elasticity imaging methodology (BEIM) to assess mechanical stiffness changes of the left ventricle (LV) based on routine cine cardiac magnetic resonance (CMR) images. We examine this methodology to assess methodological reproducibility. We assessed a cohort of 10 participants that underwent test/retest short-axis CMR imaging at baseline and follow-up sessions as part of a previous publicly available study. We compare test images to retest images acquired within the same session to assess within-session reproducibility. We also compare test and retest images acquired at the baseline imaging session to test and retest images acquired at the follow-up imaging session to assess between-session reproducibility. Results We establish the within-session and between-session reproducibility of our method, with global elasticity demonstrating repeatability within a range previously demonstrated in cardiac strain imaging studies. We demonstrate increased repeatability of global elasticity compared to segmental elasticity for both within-session and between-session. Within-subject coefficients of variation for within-session test/retest images globally for all modulus directions and a mechanical fractional mechanical stiffness anisotropy metric ranged from 11% to 28%. Conclusions Results suggest that our methodology can reproducibly generate estimates of relative mechanical elasticity of the LV and provides a threshold for distinguishing true changes in myocardial mechanical stiffness from experimental variation. BEIM has applications in identifying preclinical cardiotoxicity in breast cancer patients undergoing antineoplastic therapies.

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A multiscale strategy for assessing the micro-scale stress distribution in the matrix of textile composites

Lamon¹,

Carraro²,

Maragoni³

et al. 2022

Composites Part A: Applied Science and Manufacturing

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Standardized Compliance Matrices for General Anisotropic Materials and a Simple Measure of Anisotropy Degree Based on Shear-Extension Coupling Coefficient

Cited by 9 publications

References 25 publications

Transparent Localized Haptics: Utilization of PVDF-Type Piezoelectric Actuators on Touch-Displays

Transparent Localized Haptics: Utilization of PVDF-Type Piezoelectric Actuators on Touch-Displays

Reproducibility assessment of a biomechanical model-based elasticity imaging method for identifying changes in left ventricular mechanical stiffness

A multiscale strategy for assessing the micro-scale stress distribution in the matrix of textile composites

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