第四部分主要介绍了FBG在几个结构模型试验中的应用，包括对于冰荷载模型试验和软钢钢丝应变测量试验。
The fourth part is about the application of FBG in some structure model experiments, including the ice load model experiment and flexible pipes steel strain measurement experiment.
该方法以测量的应变值为基础，由拟合的曲线方程计算接头载荷，并与试验时施加的总载荷对比。
In this method, based on the measured strain values, the joint load is calculated by the fitted curve equation and compared with the total load applied during test.
试验结果表明，数字图像相关方法具有可行性，能够有效地测量混凝土在疲劳荷载作用下的位移和应变。
Test results demonstrated that digital image correlation method was effective, which could precisely measure the displacement and strain distribution in concrete under fatigue loading.
试验结果验证了采用非接触式光电检测技术测量中应变率材料力学性能的可行性。
The feasibility of measuring the mechanical property of material in the mid strain rate condition with the non contact photoelectric detecting technology is verified by experimental results.
试验结果表明，用应变片法测量材料的线膨胀系数是一种简单可靠且经济实用的替代方法。
The experimental results prove that the strain gauge techniqueforthermal measurement is a reliable and economic alternate method.
针对现有材料试验机上普遍采用的传统应变测量方法存在的不足，设计了利用CCD摄像机单目视觉非接触测量材料应变量的方法。
The method of measuring metallic strain using CCD camera based on monocular vision, which solved the problems existing in traditional measurement methods, was presented in this paper.
试验中测量了轴压试件的极限荷载、混凝土应变、钢筋应变、钢筋网应变以及复合砂浆应变。
In the experiment the strain of concrete, steel bar, steel mesh, composite mortar and the ultimate load carrying capacity are tested.
成形极限图通常是通过钢模胀形试验测得，实际测量的成形极限图与ASAME自动应变测试分析系统模拟计算的成形极限曲线吻合较好。
FLD is usually measured with swell test in rigid die. The tested FLD is good fit that one measured by analogue computer in ASAME (Automated Strain Analysis and measure Environment).
本文采用单试样逆光拍照法对延性材料拉伸试验缩颈后的真实应力-应变进行了有效的测量。
The backlight photography with single sample was used to measure the true stress-strain of the ductile material after necking in tensile test.
介绍了计算法测量电阻应变的原理及试验，着重分析了试验结果，验证了测量原理。
The principle of measurement of resistance strain with calculating is introduced. An experiment is conducted to verify it and analysis on the test validates it.
分析了电子引伸计应变测量误差形成的主要原因，以及对金属材料拉伸试验强度测试的影响，介绍了引伸计使用中的一些经验和注意事项。
The main cause of error of strain measurement using electronic extensometer and its effects on the strength measurement in tensile tests of metallic materials was analyzed.
试验结果表明，对于特殊的环境或者特殊结构下的应变测量，FBG具有无可比拟的优势。
The results indicate that FBG is unparalleled in strain measurement under special circumstances or structure. The fifth part is the most important point of this paper.
研究了用网格试验方法对冲压成形后覆盖件的塑性主应变分布进行测量的方法。
The grid experimental method to determine principal plastic strain distribution of auto-panel stamped parts is discussed.
通过试验测量其壳体应力、层间间隙、衬里环向应变来评价复合效果。
The effect of the compound figuration is then evaluated by measuring the shell stress, the layer gap and the lining circumferential strain during the hydraulic bulge.
目前通过应变增量计算残余应力的方法仍然是通过事先试验标定，测量超强或低强匹配焊缝中的残余应力时采用的仍然是母材的标定系数，因而会带来严重误差。
The great error could be produced in measuring the residual stress in a weld with the use of calibration coefficient for the base metal instead of the weld metal.
并进行了复合材料板拉伸试验，复合材料平板实验计算结果和应变电测法得到的结果进行了对比，实验表明两种测量方法得到的结果相吻合。
The method was also used to measure strain in the tensile test of a composite laminate plate. The results agree fairly well with those obtained by the conventional measurement.
并进行了复合材料板拉伸试验，复合材料平板实验计算结果和应变电测法得到的结果进行了对比，实验表明两种测量方法得到的结果相吻合。
The method was also used to measure strain in the tensile test of a composite laminate plate. The results agree fairly well with those obtained by the conventional measurement.
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