研究目的
Investigating the effect of high temperature up to 220°C on tensile strength degradation and strain distribution of unidirectional CFRP laminate with open hole machined with fiber laser.
研究成果
The tensile strength of laser machined CFRP laminate degraded significantly during working in high temperature above 100°C. Splitting was the prevalent failure mode under elevated temperature up to 180°C. A semi-empirical model was developed for predicting tensile performance at elevated temperature.
研究不足
The study focused on unidirectional CFRP laminate with open hole machined with fiber laser, and the mechanical behavior was evaluated up to 220°C. The effect of other machining methods or composite orientations was not investigated.
1：Experimental Design and Method Selection:
The study employed differential scanning calorimetry (DSC) to determine the glass transition temperature (Tg) of polymer-matrix composite and digital image correlation (DIC) technique to evaluate whole-field strain distribution and crack propagation/evolution under tensile loading.
2：Sample Selection and Data Sources:
Unidirectional CFRP laminate comprising high-strength carbon fibers and AM8930A/B epoxy resin was used.
3：List of Experimental Equipment and Materials:
High-power fiber laser machining center (IPG YLS-5000), universal MTS testing machine (E
4：105-B), DSC tester (STA 409 PC/4/H). Experimental Procedures and Operational Workflow:
CFRP laminates were heated at a rate of 10°C/min until reaching the set temperature for subsequent static tensile testing at a constant rate of 2 mm/min under various temperatures.
5：Data Analysis Methods:
The recorded images during loading process were analyzed using VIC 2D software to obtain the strain data.
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