Hole-drilling method is a commonly used method for measuring residual stress. The calibration coefficients in ASTM E837-13 a would cause large errors due to the plasticity deformation of materials. In the study, calib...Hole-drilling method is a commonly used method for measuring residual stress. The calibration coefficients in ASTM E837-13 a would cause large errors due to the plasticity deformation of materials. In the study, calibration coefficients were modified in the plasticity deformation stage based on the distortion energy theory. The calibration experiment of calibration coefficients was simulated by the finite element model, and the plasticity modification formulas of 7075 aluminum alloy were obtained. From the results of uniaxial tensile loading test, the measuring errors of high residual stress are significantly reduced from-4.071%～53.440% to-5.140% ～ 0.609% after the plasticity modification. This work provides an effective way to expand the application of hole-drilling method.展开更多
印刷式OLED显示技术具有不需要掩膜板、工艺流程简单、可适应大尺寸打印等优点。印刷式OLED喷墨打印机是印刷式OLED显示器件制造中的关键装备,对所处环境的温度、气压、洁净度、气流场等指标有较高要求。以上述环境指标受控为导向,分析...印刷式OLED显示技术具有不需要掩膜板、工艺流程简单、可适应大尺寸打印等优点。印刷式OLED喷墨打印机是印刷式OLED显示器件制造中的关键装备,对所处环境的温度、气压、洁净度、气流场等指标有较高要求。以上述环境指标受控为导向,分析印刷式O L E D喷墨打印微环境控制原理,提出各指标的控制方法、控制系统结构等要点。技术实施后,喷头模组区域和基板载台区域的温度精度指标分别为(22±0.5)℃和(22±0.2)℃,气压范围控制在2~10mbar(1 mbar=100 MPa),气压波动小于1.5 mbar,洁净度达到ISO2标准,气流场平流特性占主导地位。最后,对未来显示技术面临的挑战进行了展望。展开更多
基金supported by the Natural Science Foundation of Fujian Provinceof China(No.2018J01082)the China Scholarship Council(No.201806315006)the National Natural Science Foundation of China(No.51305371)
文摘Hole-drilling method is a commonly used method for measuring residual stress. The calibration coefficients in ASTM E837-13 a would cause large errors due to the plasticity deformation of materials. In the study, calibration coefficients were modified in the plasticity deformation stage based on the distortion energy theory. The calibration experiment of calibration coefficients was simulated by the finite element model, and the plasticity modification formulas of 7075 aluminum alloy were obtained. From the results of uniaxial tensile loading test, the measuring errors of high residual stress are significantly reduced from-4.071%～53.440% to-5.140% ～ 0.609% after the plasticity modification. This work provides an effective way to expand the application of hole-drilling method.
文摘印刷式OLED显示技术具有不需要掩膜板、工艺流程简单、可适应大尺寸打印等优点。印刷式OLED喷墨打印机是印刷式OLED显示器件制造中的关键装备,对所处环境的温度、气压、洁净度、气流场等指标有较高要求。以上述环境指标受控为导向,分析印刷式O L E D喷墨打印微环境控制原理,提出各指标的控制方法、控制系统结构等要点。技术实施后,喷头模组区域和基板载台区域的温度精度指标分别为(22±0.5)℃和(22±0.2)℃,气压范围控制在2~10mbar(1 mbar=100 MPa),气压波动小于1.5 mbar,洁净度达到ISO2标准,气流场平流特性占主导地位。最后,对未来显示技术面临的挑战进行了展望。
