- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Studying Stability of CFRP Composites to Low-Energy Impact Damage by Laser Vibrometry
摘要： Nondestructive quality control of small-thickness composites is an important scientific and technical problem due to significant damage inflicted on materials even with minor impact loads. The stability of a 1-mm–thick CFRP composite to impact damage with an energy of up to 10 J has been investigated. Special attention has been paid to the analysis of the “visible” area of defects formed as a result of successive striking with increasing and decreasing energy in the range from 1 to 5 J. The area of defect indications was estimated by analyzing the images of vibrations at the surface of the composite produced by its acoustic stimulation and laser vibroscanning.
关键词： scanning laser vibrometry,nondestructive testing,impact damage,CFRP composite materials
更新于2025-09-12 10:27:22
-
Modelling the heating process of CFRP by cw-laser radiation with special focus on the heat transfer by thermal radiation between the carbon fibers
摘要： In our talk, we present results of numerical calculations that describe the thermal development within a laser-impacted laminate structure made of carbon layers embedded in a polymer matrix. The FEM-calculations show, that a significant part of the heat transfer is caused by radiative heat transfer between the carbon layers at elevated temperatures. In addition to the FEM calculations, we derive analytical relationships that allow the calculation of equivalent material parameters, especially an equivalent temperature-dependent, anisotropic thermal conduction coefficient. Thus, larger structures in the mm- and cm-range consisting of multiple carbon layers can be described by a simpler geometry of a homogenous material without the need to consider the individual carbon layers having a diameter of a few μm.
关键词： heat conduction,equivalent thermal conduction coefficient,inter fiber thermal radiation,CFRP composite,FEM-calculations
更新于2025-09-12 10:27:22
-
Experimental investigation and modeling of heat affected zone and surface roughness in erbium-doped fiber laser cutting of CFRP composite
摘要： In the current era, two types of the composite, namely polymer-based composites and metal matrix composite materials are used in the industrial application, and the demand for an increase in its production is rapidly growing. But these composite materials are not so widely acceptable in the industries due to its non-machinability nature by conventional methods. Various reasons like the incorporation of defects, high strength, and hardness of the composite make the production of intricate shapes not easily achievable by traditional methods which lead to the development of new non-conventional machining methods. Laser machining method is one of the non-conventional methods which are becoming popular for cutting of composite materials due to its advantages of fast cutting speed and no contact with the workpiece. In this experimental work, an erbium-doped fiber laser is used to study the machinability of carbon fiber reinforced polymer composite and effect of various machining parameters are observed on the performance responses like heat affected zone and surface roughness. It was found that composite was easily machinable with some surface defects which were detected by SEM images. The decrease in power with an increase in scan speed and standoff distance reduces surface roughness and heat affected zone in the material.
关键词： Fiber Laser,CFRP composite,HAZ,RSM,Surface roughness
更新于2025-09-11 14:15:04