为了实现低成本三维打印制备金属、陶瓷零件,研究了喷射UV光固化粘结剂的3DP法,介绍了该3DP法三维打印制备金属、陶瓷零件的完整工艺流程,研究了所采用的UV光固化粘结剂的有关特性。结果表明,紫外光照强度在750~1500 m W/cm2内对粘结剂...为了实现低成本三维打印制备金属、陶瓷零件,研究了喷射UV光固化粘结剂的3DP法,介绍了该3DP法三维打印制备金属、陶瓷零件的完整工艺流程,研究了所采用的UV光固化粘结剂的有关特性。结果表明,紫外光照强度在750~1500 m W/cm2内对粘结剂的固化情况影响不大,峰值固化时间都在4~5 s,总固化时间在21~22 s。粘结剂加热到约230℃时完全固化,约340℃时开始分解,约460℃时分解完全。固化后的粘结剂及其烧损后的残留物中主要含C、H和O三种元素。所得到的研究结果可为整个工艺过程有关参数的选择和最终制件成分的控制提供依据。展开更多
This review aims to discuss the application and development of three-dimensional printing(3DP) technology in the field of rock mechanics and the mechanical behaviors of 3D-printed specimens on the basis of various ava...This review aims to discuss the application and development of three-dimensional printing(3DP) technology in the field of rock mechanics and the mechanical behaviors of 3D-printed specimens on the basis of various available printing materials.This review begins with a brief description of the concepts and principles associated with 3DP, and then systematically elaborates the five major applications of 3DP technology in the field of rock mechanics, namely, the preparation of rock(including pre-flawed rock) specimens, preparation of joints, preparation of geophysical models, reconstruction of complex rock structures, and performance of bridging experimental testing and numerical simulation.Meanwhile, the mechanical performance of 3D-printed specimens created using six different printing materials, such as polymers, resin,gypsum, sand, ceramics, and rock-like geological materials, is reviewed in detail.Subsequently, some improvements that can make these 3D-printed specimens close to natural rocks and some limitations of 3DP technology in the application of rock mechanics are discussed.Some prospects that are required to be investigated in the future are also proposed.Finally, a brief summary is presented.This review suggests that 3DP technology, especially when integrated with other advanced technologies, such as computed tomography scanning and 3D scanning, has great potential in rock mechanics field.展开更多
This study presents a visualized approach for tracking joint surface morphology.Three-dimensional laser scanning(3DLS)and 3D printing(3DP)techniques are adopted to record progressive failure during rock joint shearing...This study presents a visualized approach for tracking joint surface morphology.Three-dimensional laser scanning(3DLS)and 3D printing(3DP)techniques are adopted to record progressive failure during rock joint shearing.The 3DP resin is used to create transparent specimens to reproduce the surface morphology of a natural joint precisely.The freezing method is employed to enhance the mechanical properties of the 3DP specimens to reproduce the properties of hard rock more accurately.A video camera containing a charge-coupled device(CCD)camera is utilized to record the evolution of damaged area of joint surface during the direct shear test.The optimal shooting distance and shooting angle are recommended to be 800 mm and 40?,respectively.The images captured by the CCD camera are corrected to quantitatively describe the damaged area on the joint surface.Verification indicates that this method can accurately describe the total sheared areas at different shear stages.These findings may contribute to elucidating the shear behavior of rock joints.展开更多
文摘为了实现低成本三维打印制备金属、陶瓷零件,研究了喷射UV光固化粘结剂的3DP法,介绍了该3DP法三维打印制备金属、陶瓷零件的完整工艺流程,研究了所采用的UV光固化粘结剂的有关特性。结果表明,紫外光照强度在750~1500 m W/cm2内对粘结剂的固化情况影响不大,峰值固化时间都在4~5 s,总固化时间在21~22 s。粘结剂加热到约230℃时完全固化,约340℃时开始分解,约460℃时分解完全。固化后的粘结剂及其烧损后的残留物中主要含C、H和O三种元素。所得到的研究结果可为整个工艺过程有关参数的选择和最终制件成分的控制提供依据。
基金financially supported by the Fundamental Research Funds for the Central Universities (No.FRF-TP18-016A3)the National Natural Science Foundation of China (No.51504016)。
文摘This review aims to discuss the application and development of three-dimensional printing(3DP) technology in the field of rock mechanics and the mechanical behaviors of 3D-printed specimens on the basis of various available printing materials.This review begins with a brief description of the concepts and principles associated with 3DP, and then systematically elaborates the five major applications of 3DP technology in the field of rock mechanics, namely, the preparation of rock(including pre-flawed rock) specimens, preparation of joints, preparation of geophysical models, reconstruction of complex rock structures, and performance of bridging experimental testing and numerical simulation.Meanwhile, the mechanical performance of 3D-printed specimens created using six different printing materials, such as polymers, resin,gypsum, sand, ceramics, and rock-like geological materials, is reviewed in detail.Subsequently, some improvements that can make these 3D-printed specimens close to natural rocks and some limitations of 3DP technology in the application of rock mechanics are discussed.Some prospects that are required to be investigated in the future are also proposed.Finally, a brief summary is presented.This review suggests that 3DP technology, especially when integrated with other advanced technologies, such as computed tomography scanning and 3D scanning, has great potential in rock mechanics field.
基金This experimental study was partially funded by the National Natural Science Foundation of China(Grant Nos.41572299and 41831290)the 3D-printed modeling work was supported by the Zhejiang Provincial Natural Science Foundation of China(Grant No.LY18D020003),which is gratefully acknowledged.
文摘This study presents a visualized approach for tracking joint surface morphology.Three-dimensional laser scanning(3DLS)and 3D printing(3DP)techniques are adopted to record progressive failure during rock joint shearing.The 3DP resin is used to create transparent specimens to reproduce the surface morphology of a natural joint precisely.The freezing method is employed to enhance the mechanical properties of the 3DP specimens to reproduce the properties of hard rock more accurately.A video camera containing a charge-coupled device(CCD)camera is utilized to record the evolution of damaged area of joint surface during the direct shear test.The optimal shooting distance and shooting angle are recommended to be 800 mm and 40?,respectively.The images captured by the CCD camera are corrected to quantitatively describe the damaged area on the joint surface.Verification indicates that this method can accurately describe the total sheared areas at different shear stages.These findings may contribute to elucidating the shear behavior of rock joints.
