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Dynamic fracture behavior of ceramics at elevated temperatures by caustics

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Abstract

The fracture behavior of partially stabilized zirconia (PSZ) and silicon-nitride ceramics (Si3N4) is investigated under dynamic loading at elevated temperatures up to 1200°C using the caustic method combined with an ultra high-speed camera. The values of the dynamic fracture toughnessK Id and the crack-propagation fracture toughnessK ID are obtained, and it is shown that a dynamic effect on these values is observed in PSZ but not in Si3N4. The dynamic crack arrest toughnessK Ia is found to exist for PSZ.

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Abbreviations

a :

crack length

\(\dot a\) :

crack velocity

C AE :

velocity of the visualized pattern based onAE-wave

C R :

Rayleigh wave velocity

C S :

distortional wave velocity

c 0 :

optical constant of caustics

D :

diameter of the caustic pattern

E :

Young's modulus

\(\dot K\) :

stress intensity factor rate

K I :

stress intensity factor of Mode I

K Ia :

dynamic crack arrest toughness

K Ic :

static fracture toughness

K ID :

crack-propagation fracture toughness

K Id :

dynamic fracture toughness

K Im :

stress intensity factor at\(\dot a\)≒0

r 0 :

radius of the initial curve

T :

testing temperature

t :

thickness of specimen

z 0 :

distance between the specimen and the image plane

δ:

ratio ofD tor 0 in the case of λ=1

λ:

magnification factor of the optical system

μ:

Poisson's ratio

ρ:

notch root radius

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Authors and Affiliations

  1. Department of Mechanical Engineering, Suzuka National College of Technology, Shiroko, 510-02, Suzuka, Mie, Japan

    M. Suetsugu (Research Associate)

  2. Department of Mechanical Engineering, Kanto Gakuin University, 4834 Mutsuura, Kanazawa-ku, 236, Yokohama, Japan

    K. Shimizu (SEM Member) & S. Takahashi (SEM Member)

Authors
  1. M. Suetsugu
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  2. K. Shimizu
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  3. S. Takahashi
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Suetsugu, M., Shimizu, K. & Takahashi, S. Dynamic fracture behavior of ceramics at elevated temperatures by caustics. Experimental Mechanics 38, 1–7 (1998). https://doi.org/10.1007/BF02321259

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