Fitting Models to Composite Materials Fatigue Data

Validation of fatigue damage model for composites made of various fiber types and configurations

Journal of Composite Materials ◽

10.1177/0021998317722402 ◽

2017 ◽

Vol 52 (9) ◽

pp. 1183-1191 ◽

Cited By ~ 1

Author(s):

Asim Shahzad ◽

Sana Ullah Nasir

Keyword(s):

Composite Materials ◽

Glass Fiber ◽

Fatigue Damage ◽

Natural Fiber ◽

Hybrid Composites ◽

Fiber Types ◽

Fiber Reinforced ◽

Hemp Fiber ◽

Fatigue Data ◽

Polyester Composites

Empirical model for predicting fatigue damage behavior of composite materials developed recently has been applied to composite materials made of different fibers in various configurations: carbon and glass fiber noncrimp fabric reinforced epoxy composites, chopped strand mat glass fiber-reinforced polyester composites, randomly oriented nonwoven hemp fiber-reinforced polyester composites, and glass/hemp fiber-reinforced polyester hybrid composites. The fatigue properties were evaluated in tension–tension mode at stress ratio R = 0.1 and frequency of 1 Hz. The experimental fatigue data were used to determine the material parameters required for the model. It has been found that the model accurately predicts the degradation of fatigue life of composites with an increase in number of fatigue cycles. The scope of applicability of this model has thus been broadened by using the fatigue data of natural fiber and noncrimp fabric composites.

Download Full-text

Fatigue of Composite Materials under Aircraft Service Loading

Proceedings of the Institution of Mechanical Engineers Part G Journal of Aerospace Engineering ◽

10.1243/pime_proc_1996_210_348_02 ◽

1996 ◽

Vol 210 (1) ◽

pp. 101-107 ◽

Cited By ~ 1

Author(s):

IR Farrow

Keyword(s):

Composite Materials ◽

Damage Accumulation ◽

Local Strain ◽

Life Assessment ◽

Current Analysis ◽

Fatigue Life Assessment ◽

Analysis Methods ◽

Fatigue Damage Accumulation ◽

Fatigue Data ◽

Service Loading

Fatigue damage accumulation and analysis methods are considered for composites and contrasted with metals. The failure of current analysis methods is illustrated and explained by the information missing in load idealization data. Detailed local strain operational monitoring with local strain fatigue data is proposed as a future approach to fatigue life assessment of composite materials under aircraft service loading.

Download Full-text

Comparative Microstructures of Ion Milled and Electrochemically Thinned Composite Materials

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100052742 ◽

1974 ◽

Vol 32 ◽

pp. 546-547

Author(s):

R.R. Russell

Keyword(s):

Electron Microscopy ◽

Transmission Electron Microscopy ◽

Composite Materials ◽

Great Difficulty ◽

Ion Milling ◽

Transmission Electron ◽

Ion Damage ◽

Intermetallic Composite

Transmission electron microscopy of metallic/intermetallic composite materials is most challenging since the microscopist typically has great difficulty preparing specimens with uniform electron thin areas in adjacent phases. The application of ion milling for thinning foils from such materials has been quite effective. Although composite specimens prepared by ion milling have yielded much microstructural information, this technique has some inherent drawbacks such as the possible generation of ion damage near sample surfaces.

Download Full-text

Transmission electron microscopy of composite materials

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100107125 ◽

1988 ◽

Vol 46 ◽

pp. 1012-1015

Author(s):

K.P.D. Lagerlof

Keyword(s):

Composite Materials ◽

Physical Properties ◽

Structural Defects ◽

Structural Composites ◽

Multiphase Materials ◽

Structural Reinforcement ◽

Transmission Electron ◽

Reinforced Fiber ◽

Particulate Reinforced Composites ◽

Definition Of

Although most materials contain more than one phase, and thus are multiphase materials, the definition of composite materials is commonly used to describe those materials containing more than one phase deliberately added to obtain certain desired physical properties. Composite materials are often classified according to their application, i.e. structural composites and electronic composites, but may also be classified according to the type of compounds making up the composite, i.e. metal/ceramic, ceramic/ceramie and metal/semiconductor composites. For structural composites it is also common to refer to the type of structural reinforcement; whisker-reinforced, fiber-reinforced, or particulate reinforced composites [1-4].For all types of composite materials, it is of fundamental importance to understand the relationship between the microstructure and the observed physical properties, and it is therefore vital to properly characterize the microstructure. The interfaces separating the different phases comprising the composite are of particular interest to understand. In structural composites the interface is often the weakest part, where fracture will nucleate, and in electronic composites structural defects at or near the interface will affect the critical electronic properties.

Download Full-text