Research On Resistance Creep Properties Of Epoxy Resin Composites Based On Carbon Nanotubes

A carbon nanotube conductive composite materials with good electrical conductivity and mechanical properties were obtained by dispersing the carbon nanotubes into the polymer matrix,which has good structural design ability and can be added into the system or equipment by making the parts into parts.Moreover,a randomly arranged carbon nanotube networks in the composite material often exhibit an isotropy,and make the carbon nanotubes showing a characteristics such as stress-resistance,strain-resistance,temperature-resistance,etc.,Therefore,the parts made from the composite material present a good sensitivity of resistance response and can be used to monitor the operation status of the device.A composite materials can not only be added to a system or a device but also monitor their operational status,undoubtedly having an ability to perform in-situ detection and showing a broad prospects in aspects of development and application in the future.Although the composite material has great potential in application of in-situ detection,the creep property of which makes the resistance value changing with time in influence of constant stress,thus affecting the stability of the monitoring system and making a greatly restriction of application.In this study,a multi-walled carbon nanotubes/epoxy composite materials were prepared and aged,and the electrical and mechanical properties were studied.The resistance creep and dynamic response characteristics of the composite materials before and after aging were researched.Finally,the application of composite materials in sensors was verified by performance tests on actual machine tools.Firstly,the carbon nanotube conductive composite materials were fabricated into gaskets and pin bars by solution mixing casting method,and the electrical and mechanical properties before and after aging were investigated.Secondly,according to the influence of temperature and stress on the creep resistance of composite materials,an experiment for testing the resistance creep behavior in different temperatures was designed,and a resistance creep curve model was summarized andestablished.And a resistance creep model with good fitting effect and the relationship of resistance vs time were obtained finally by analyzing the curves of strain vs time and resistance vs time and relationship of strain vs resistance of the gaskets in constant stress and constant temperature environment,and variation regulation of resistance as well as model fitted.The resistance creep of the composite material during long-term load was studied and the material stability state is predicted by the model curve model.It provides a basis for the application of composite materials in in-situ detection and shows a certain practical significance.finally,based on the dynamic response principle,a dynamic response experiments and platforms was designed.It was researched that the response of composite materials in different vibration frequency signals,and the influence of the aging on their dynamic response performances and the application of composite materials in actual processing.The results indicated that the composite material has a good application effect in actual processing,and can detect various frequency signals during processing,which provides an experimental basis for subsequent sensor manufacturing.