GFRP (glass fiber reinforced plastic) anchor rod stretching process meso-mechanics analysis method
A technology of mesomechanics and analytical methods, applied in special data processing applications, instruments, electrical digital data processing, etc., capable of solving problems such as static single defects and ignoring the evolution of defects
Inactive Publication Date: 2018-11-30
CHINA UNIV OF MINING & TECH
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Problems solved by technology
For the mesomechanical models with the above three failure forms, most of the research work in the literature is limited to the case of a static single defect, ignoring the evolution of the defect during the loading process.
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[0036] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0037] 1. Establishment of finite element model
[0038] 1.1 Geometric model establishment. In the GFRP bolt studied by numerical calculation in this paper, the fiber phase is isotropic long fiber, which is equal to the length of the bolt body, perpendicular to the cross section of the bolt, and evenly distributed in the whole bolt body; the resin matrix is unsaturated polyester resin. Select a suitable volume size, and embed seven high-strength glass fibers at equal intervals in the resin matrix, numbered in order, n=1, 2, 3, 4, 5, 6, 7, and the fiber diameter and spacing are both 8 μm. The fourth glass fiber (that is, the middle glass fiber) is preset to break at the middle position, and the finite element model is as follows: figure 1 shown.
[0039] 2.2 Material properties
[0040] In this numerical calculation study, the elastic modulus and P...
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The invention relates to a GFRP (glass fiber reinforced plastic) anchor rod stretching process meso-mechanics analysis method which includes the steps: building a finite element model; performing numerical calculation and analyzing numerical calculation results; considering complicated interaction generated by various microscopic destruction patterns in the microscopic damage accumulation processof an GFRP anchor rod, the effect of specific important components of an interface serving as a composite material on damage evolution and defect evolution in the loading process, and finishing crackexpansion in the stretching process of the GFRP anchor rod and meso-mechanics theory analysis of fiber stress to obtain the expansion condition of cracks on interfaces and bases, stress concentrationconditions and interfacial debonding conditions of weak interfaces and strong interfaces, the stress concentration conditions of broken fibers and adjacent fibers, stress restoration conditions and the like. Various effective numerical values of crack expansion in the stretching process of the GFRP anchor rod are accurately acquired, and crack expansion and fiber stress regularities in the stretching process of the GFRP anchor rod are acquired.
Description
technical field [0001] The invention relates to the field of material analysis, in particular to a method for analyzing mesomechanics in the stretching process of GFRP anchor rods. Background technique [0002] For the theoretical research of Glass Fiber Reinforced Polymer Composite (GFRP) for short, there are currently two important developments that have gained the attention and general recognition of the industry. One is the application and development of mesomechanics, and the other is the proposal of the interface phase structure. and performance studies. The mesomechanics of GFRP is to theoretically establish and derive methods and expressions that can characterize the overall basic physical performance parameters of GFRP composites based on the physical properties and interactions of the materials in each phase. For GFRP, the fiber and the matrix are taken as the basic units, and they are regarded as homogeneous materials with different properties. Effect (interface...
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IPC IPC(8): G06F17/50
CPCG06F30/23G06F2119/06
Inventor 王延庆刘增光吴北成
Owner CHINA UNIV OF MINING & TECH