Design And Experimental Study Of The Situ Nano-indentation Mechanical Properties Test System Based On Tension And Bending Loads

Deformation of various types of materials and products that occur during theservice, damage, failure and destruction of a large variety of result types arecombined action of the external load, the same material under different load patternsmay exhibit very different mechanical behavior. Thus, by in situ mechanical testingof composite load model means bound to reveal many types of external loads canaffect the role of material deformation common injury found more novel phenomenaand laws in relation to the larger size of the test specimens will be undertakenconducive to study the mechanical behavior of real damage and deformationmechanism of materials and products in service state.Comparative analysis of current research and existing problems, combinedwith the accumulation of research, from the scanning electron microscope toachieve multi-load mode, principles and methods of in-situ mechanical testing ofdeparture: preferred drive, load and detection methods, combined with effectiveSEM vacuum chamber space determine the overall layout of the test platform, usingscanning electron microscopy was performed to locate the weak parts of the testpiece to monitor and achieve macroeconomic conditions close to the specimen usingmicroscopic mechanical properties of in-situ testing. Research in the theoreticalanalysis, simulation and experimental studies to test a combination of methods, thedriver is loaded, detection, control unit to optimize the design, according to theoptimization results, develop prototypes and test analysis. According to theexperimental studies, the need to verify the accuracy and problems correctedtheoretical analysis, conduct research to expand, to draw final conclusions. Adjustable tension on-the preload bend situ nanoindentation test system for acombination of traditional cm above the level of the feature size of thethree-dimensional macroscopic specimens, tensile bending under a scanningelectron microscope to test the mechanical properties in situ, and the originalcomprehensive testing technology bit nanoindentation testing in achieving tensilebending while doing situ indentation testing instrument. Precision Mechatronicsbelongs to the field of science instruments. Including in-situ nanoindentation testmodule, tensile and bending load modules preload preload load module. Testplatform for combining traditional feature size cm above the level of thethree-dimensional macroscopic specimen can be realized on the tensile-situnanoindentation tests under bending preload can be achieved with Hitachi TM-1000scanning electron microscope and various types of imaging devices having a cavityand stage structure compatible use. Through a highly integrated small stretch-bending preload material loading device to achieve dynamic tensile bending whiledriving piezoelectric principle diamond indenter achieve nanoscale indentation testthrough high-resolution force sensor and displacement sensors to achieve indenterload and the indentation depth into the signals picked up by the data acquisitionsoftware acquisition and processing to obtain the press-fit load-depth curve,obtained based on the elastic contact theory hardness or curved at different stages ofthe drawing step, the elastic modulus mechanical parameters such as volume, toachieve a tensile or flexural mechanical properties of real-time detection and surfacemechanical properties of the test specimen surface distribution detection. Combinedwith sophisticated detection, initial contact detection, control unit and arithmeticprocedures, but also to ensure that tension/compression load pre-loaded testmodule, pre-loaded bending load nanoindentation test module and test module isloaded timing arbitrary choice. The present invention is compact, compact andstrain rate control, and all major scanning electron microscopy, atomic force microscopy, Raman spectroscopy, X-ray diffraction and optical microscopyimaging instrument has good structural compatibility, vacuum and electromagneticcompatibility compatibility. Can be carried out under the observation of varioustypes of imaging instruments for cross-scale materials feature size cm above thelevel of the three-dimensional specimen stretch-bending under preload situnanoindentation tests on the material in the composite drawing-microscopic pre-loads the next bend deformation, damage and fracture processes on-line monitoring,to reveal the microscopic deformation behavior and material damage mechanismprovides a new test method.