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| Several problem studies in solid mechanics by spanning the scale computation analysis |
| Received:September 09, 2023 Revised:October 15, 2023 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20230909003 |
| KeyWord:computational solid mechanics spanning the scale nano-micro scale plastic flow stress coarse-grained molecular dynamics data-driven defect bone reconstruction |
| Author | Institution |
| 庄茁 |
清华大学 航天航空学院, 北京 |
| 严子铭 |
清华大学 航天航空学院, 北京 |
| 姚凯丽 |
清华大学 航天航空学院, 北京 |
| 崔一南 |
清华大学 航天航空学院, 北京 |
| 柳占立 |
清华大学 航天航空学院, 北京 |
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| Abstract: |
| This paper presents several problem studies in solid mechanics area by spanning the scale computation analysis.(1) The calculation model of coupling discrete dislocation dynamics and the finite element method (DDD-FEM) is proposed, which realizes the study for finite deformation crystal plasticity based on dislocation mechanism, and establishes the theory of plastic flow stress at micro-scale and nano-scale (200 nm~10 μm), and combines with test data to verify the size effects of strength and deformation without strain gradient.(2) The storage modulus and loss modulus of micro-scale polyurea in time domain and frequency domain are obtained by using the nano-scale coarse-grained molecular dynamics model (CG-MD).The design problem of microphase separation polymer copolymers is solved by dynamic loading analysis and ultrasonic test data verification.(3) Through data-driven identification of the characteristic values of high-resolution micro-scale CT images and clinical low-resolution millimeter-scale CT images, the equivalent modulus and structural tensor of articular cancellous bone trabeculae is established, which lays the foundation for the bone tissue structure additive manufacturing lattice design and personalized bone defect reconstruction. |
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