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Fatigue toughness

Keywords Contact fatigue Toughness Fatigue properties Wear... [Pg.154]

The DCG process is of considerable interest, not only because it is unique to polymers, but also because a large percentage of the FCP lifetime is spent in the DCG process. Furthermore, the manner in which the DCG process terminates (vis a vis the craze and shear competition) strongly influences the fatigue crack growth resistance (or fatigue toughness). [Pg.270]

Class MOR 4 Shear Str. Toughness Fatigue Fatigue Toughness Fatigue Characteristics... [Pg.345]

The fracture surfaces, revealed when the tube is broken open, are found to be smooth with a rippled appearance characteristic of fatigue. This type of behavior is sometimes known as leak before break. On the other hand, if the material lacks toughness, the propagation of the fatigue crack may be intermpted part way through the wall by the intervention of fast fracture, resulting in what is sometimes known as the break before leak mode of failure. [Pg.89]

The material in use as of the mid-1990s in these components is HDPE, a linear polymer which is tough, resiUent, ductile, wear resistant, and has low friction (see Olefin polymers, polyethylene). Polymers are prone to both creep and fatigue (stress) cracking. Moreover, HDPE has a modulus of elasticity that is only one-tenth that of the bone, thus it increases the level of stress transmitted to the cement, thereby increasing the potential for cement mantle failure. When the acetabular HDPE cup is backed by metal, it stiffens the HDPE cup. This results in function similar to that of natural subchondral bone. Metal backing has become standard on acetabular cups. [Pg.188]

Fig. 3. Effect of cross-link density where A represents tear strength, fatigue life, and toughness B, elastic recovery and stiffness C, strength and D,... Fig. 3. Effect of cross-link density where A represents tear strength, fatigue life, and toughness B, elastic recovery and stiffness C, strength and D,...
Mechanical Modulus Yield and tensile strength Hardness Fracture toughness Fatigue strength Creep strength Damping... [Pg.4]

The first - creep - is our interest here. The second - resistance to oxidation - is the subject of Chapter 21. Toughness and fatigue resistance (Chapters 13 and 15) are obviously important blades must be tough enough to withstand the impact of birds... [Pg.198]

Table 27.5 Properties of body-panel materials toughness, fatigue and creep... Table 27.5 Properties of body-panel materials toughness, fatigue and creep...
The fracture toughness for the steel is 200 MN m". The growth of the crack by fatigue may be represented approximately by the equation... [Pg.285]

Answers Structure-sensitive properties yield strength, hardness, tensile strength, ductility, fracture toughness, fatigue strength, creep strength, corrosion resistance. [Pg.12]

The toughness of wood is important in design for exactly the same reasons that that of steel is it determines whether a structure (a frame building, a pit prop, the mast of a yacht) will fail suddenly and unexpectedly by the propagation of a fast crack. In a steel structure the initial crack is that of a defective weld, or is formed by corrosion or fatigue in a wooden structure the initial defect may be a knot, or a saw cut, or cell damage caused by severe mishandling. [Pg.284]

Composites High E, CTy, k c but cost Stiff (E > 50 GPo) Strong a = 200 MPa) Tough (kic > 20 MPa m ") Fatigue resistant Corrosion resistant Low density Formobility Cost Creep (polymer matrices)... [Pg.289]

At and near room temperature, metals have well-defined, almost constant, moduli and yield strengths (in contrast to polymers, which do not). And most metallic alloys have a ductility of 20% or better. Certain high-strength alloys (spring steel, for instance) and components made by powder methods, have less - as little as 2%. But even this is enough to ensure that an unnotched component yields before it fractures, and that fracture, when it occurs, is of a tough, ductile, type. But - partly because of their ductility - metals are prey to cyclic fatigue and, of all the classes of materials, they are the least resistant to corrosion and oxidation. [Pg.290]


See other pages where Fatigue toughness is mentioned: [Pg.309]    [Pg.310]    [Pg.157]    [Pg.214]    [Pg.474]    [Pg.309]    [Pg.310]    [Pg.157]    [Pg.214]    [Pg.474]    [Pg.1012]    [Pg.386]    [Pg.545]    [Pg.77]    [Pg.90]    [Pg.97]    [Pg.129]    [Pg.130]    [Pg.398]    [Pg.130]    [Pg.188]    [Pg.382]    [Pg.528]    [Pg.420]    [Pg.126]    [Pg.8]    [Pg.8]    [Pg.14]    [Pg.489]    [Pg.266]    [Pg.2518]    [Pg.3]    [Pg.6]    [Pg.129]    [Pg.202]    [Pg.268]    [Pg.11]    [Pg.173]    [Pg.289]   
See also in sourсe #XX -- [ Pg.270 ]




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