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| Analysis of crack evolution and mechanical properties degradation of polymer bonded explosives based on phase-field fracture |
| Received:December 17, 2022 Revised:February 14, 2023 |
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| DOI：10.7511/jslx20221217001 |
| KeyWord:Polymer-bonded Explosives meso-scale morphology thermal viscoelasticity fracture phase-field model crack evolution |
| Author | Institution |
| 龙旭 |
西北工业大学 力学与土木建筑学院, 西安 |
| 朱佳琦 |
西北工业大学 力学与土木建筑学院, 西安 |
| 苏昱太 |
西北工业大学 力学与土木建筑学院, 西安 |
| 姜夕博 |
西安近代化学研究所, 西安 |
| 金朋刚 |
西安近代化学研究所, 西安 |
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| Abstract: |
| In order to analyze the crack evolution process of polymer-bonded explosives (PBXs) and their mechanical behavior,a thermal-viscoelastic phase-field fracture model is proposed by considering the influence and mechanism of their elastic,viscous and thermal properties.Based on the proposed phase-field fracture model,a one-element model of the thermal-viscoelastic material is established,and the parameters are analyzed for different temperatures and strain rates.Then,based on the PBX,the simulation of the fracture phase field is performed and the model parameters are calibrated.Thus,based on the fracture phase field,the crack evolution of PBX material and its mechanical property degradation are further clarified from the meso-scale level under different strain rates and different ambient temperatures.The results show that the fracture driving energy and compressive strength tend to decrease with decreasing strain rate and increasing temperature,which delays the crack occurrence and the impede the crack propagation. |
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