| Direct tension and fracture resistance curves of ultra high performance marine composite materials |
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| 作者姓名： | 吴香国 韩相默 |
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| 作者单位： | School of Civil Engineering，Kumoh National Institute of Technology，College of Architecture Engineering，Harbin Engineering University |
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| 基金项目： | Supported by the Center of Concrete Corea, Korea Development and Application of High Performance and Multi-Function Concrete （05-CCT-D11 ）. |
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| 摘 要： | Fracture behavior is one of the most important, yet still little understood properties of ultra-high performance cementitious composites （UHPCC）, a new marine structural engineering material. Research on the fracture and direct tension behavior of UHPCC was carried out. The constitution law of UHPCC was divided into three phases： pre-partial debonding, partial debonding, and pullout phases. A direct tension constitution law was constructed based on the proposed fiber reinforcing parameter as a function of fiber volume fraction, fiber diameter and length, and fiber bonding strength. With the definition of linear crack shape, the energy release rate of UHPCC was derived and the R-curve equation was calculated from this. Loading tests of UHPCC using a three-point bending beam with an initial notch were carried out. The predictions from the proposed R-curve were in good agreement with the test results, indicating that the proposed R-curve accurately describes the fracture resistance of UHPCC. Introduction of a fiber reinforcement parameter bridges the fracture property R-curve and micro-composites＇ mechanics parameters together. This has laid the foundation for further research into fracture properties based on micro-mechanics. The proposed tension constitution law and R-curve can be references for future UHPCC fracture evaluation.
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| 关 键 词： | 直接拉力 断裂抵抗曲线 极端高性能 有粘性的化合物 电阻压力 |
Direct tension and fracture resistance curves of ultra high performance marine composite materials |
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| Xiang-guo Wu,Sang-mook Han.Direct tension and fracture resistance curves of ultra high performance marine composite materials[J].Journal of Marine Science and Application,2008,7(3):218-225. |
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| Authors: | Xiang-guo Wu Sang-mook Han |
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| Institution: | [1]School of Civil Engineering, Kumoh National Institute of Technology, Gumi 730-701, South Korea [2]College of Architecture Engineering, Harbin Engineering University, Harbin 150001, China |
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| Abstract: | Fracture behavior is one of the most important,yet still little understood properties of ultra-high performance cementitious composites(UHPCC),a new marine structural engineering material. Research on the fracture and direct tension behavior of UHPCC was carried out.The constitution law of UHPCC was divided into three phases:pre-partial debonding,partial debonding,and pullout phases.A direct tension constitution law was constructed based on the proposed fiber reinforcing parameter as a function of fiber volume fraction,fiber diameter and length,and fiber bonding strength.With the definition of linear crack shape,the energy release rate of UHPCC was derived and the R-curve equation was calculated from this.Loading tests of UHPCC using a three-point bending beam with an initial notch were carried out.The predictions from the proposed R-curve were in good agreement with the test results, indicating that the proposed R-curve accurately describes the fracture resistance of UHPCC.Introduction of a fiber reinforcement parameter bridges the fracture property R-curve and micro-composites' mechanics parameters together.This has laid the foundation for further research into fracture properties based on micro-mechanics.The proposed tension constitution law and R-curve can be references for future UHPCC fracture evaluation. |
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| Keywords: | ultra high performance cementitious composites fracture resistance curve direct tension |
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