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  • 1
    Electronic Resource
    Electronic Resource
    Correlations among dynamic stress intensity factor, crack velocity and acceleration in brittle fracture (2000)
    Springer
    International journal of fracture 105 (2000), S. 311-320 
    Details
    ISSN: 1573-2673
    Keywords: Dynamic crack propagation ; stress intensity factor ; crack velocity ; crack acceleration ; caustic method ; high-speed photography ; PMMA.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Dynamic fracture in PMMA was studied to determine the correlations among dynamic stress intensity factor K ID, crack velocity $$ \dot a $$ and acceleration ä. Specimen geometry, a single-edge-cracked tensile plate with two circular holes, was employed to obtain the crack acceleration, deceleration and re-acceleration process in a single fracture event. K ID was evaluated using the method of caustics in combination with a Cranz-Schardin high-speed camera and correlated with $$ \dot a $$ and ä. The behaviors of K ID $$ \dot a $$ and ä in a SEN specimen were also examined, and the following correlations were obtained: (1) K ID was an increasing function of $$ \dot a $$ , but their relation was not unique. (2) K ID for a constant velocity $$ \dot a $$ was larger when the crack was decelerated than when it was accelerated. (3) K ID was dependent on both $$ \dot a $$ and ä, and K ID for ä=constant could be uniquely related to $$ \dot a $$ .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007654002732
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Fracture Roughness Evolution During Mode I Dynamic Crack Propagation in Brittle Materials (1998)
    Springer
    International journal of fracture 90 (1998), S. 119-131 
    Details
    ISSN: 1573-2673
    Keywords: Dynamics ; roughness ; stress intensity ; crack velocity ; acceleration ; high speed photography ; caustic method ; photoelastic method.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The evolution of roughness RMS during dynamic fracture in thin plates of epoxy (Araldite B) was studied in relation to important fracture parameters such as crack velocity a, acceleration and deceleration ä and mode I stress intensity factors ( KID ). Dual-focus high speed photography was carried out to evaluate values of KID by the caustic ( KID ( C ) ) and photoelastic ( KID ( P ) ) methods simultaneously. A specially designed jig applied successive tensile loadings to specimens which resulted in cyclic change of a and ä. The changes of a, RMS and KID are shown to be qualitatively similar with respect to the value of a. Quantitatively, a typical result showed that the position of the first maximum value of a came 7 mm behind the first loading axis, while that of KID ( P ), RMS and KID, ( C ) appeared on the fracture surface 7 mm, 15 mm, and 25 mm behind the axis, respectively. The agreement between KID ( C ) and KID ( P ) was acceptable except for data around the first loading axis. Discussions are given on the uniqueness problem of a and KID.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007443419107
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Crack veolcity and acceleration effects on dynamic stress intensity factor in polymers (1997)
    Springer
    International journal of fracture 83 (1997), S. 305-313 
    Details
    ISSN: 1573-2673
    Keywords: dynamic crack propagation ; stress intensity factor ; crack velocity ; a cceleration ; polymers ; PMMA ; expoxy ; caustic method.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Dynamic crack propagations in PMMA and epoxy specimens were studied using the method of caustics in combination with a Cranz-Schardin type high-speed camera. Single-edge-cracked tensile specimens were fractured under pin-loading conditions so that cracks could experience acceleration, deceleration and re-acceleration stages in one fracture process. The dynamic stress intensity factor K ID, crack velocity a and acceleration a were evaluated in the course of crack propagation to examine the effects of a and a on K ID. Results showed that a and a were important factors in changing the values of K ID, and for constant a the decelerating crack had a larger value of K ID than the accelerating or re-accelerating crack. Also, it was found that K ID could be expressed as two parametric functions of and a for PMMA and epoxy specimens.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007387417517
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Dynamic crack propagation and unloading behavior of brittle polymers (1999)
    Springer
    International journal of fracture 96 (1999), S. 347-360 
    Details
    ISSN: 1573-2673
    Keywords: Dynamic crack propagation ; unloading behavior ; stress intensity factor ; crack velocity ; unloading rate ; brittle polymers ; epoxy ; PMMA ; homalite-100 ; caustic method.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The method of caustics in combination with a Cranz–Schardin high-speed camera was utilized to study dynamic crack propagation and unloading behavior of epoxy, PMMA and Homalite-100 specimens. Dynamic stress intensity factor K ID and crack velocity $$\dot a$$ were evaluated in the course of crack propagation. Caustic patterns at the loading points were also recorded to estimate load P applied to the specimen. Unloading rate $$\dot P$$ , the time derivative of P, was determined as a function of time t, and its time correlation with K ID or $$\dot a$$ was examined. The findings showed that the change in $$\dot P$$ was qualitatively in accord with the change in K ID or $$\dot a$$ . However, there existed slight differences among the values of t giving the maximum $$\dot P$$ , $$\dot a$$ and K ID, so that their order was $$\dot a$$ , $$\dot P$$ and K ID.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018697630909
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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