Abstract
Brittle failure of many thermoplastics is associated with craze formation and governed by craze breakdown. Optical interferometry is a powerful tool for the investigation of this type of plastic deformation in transparent polymers, especially for the measurement of sizes of single crack tip crazes. The results of interferometric measurements are used in connection with fracture mechanics models and mathematical or numerical methods for calculations of stresses in the microregion at the crack tip and thus giving qualitative and quantitative descriptions of deformation and fracture processes. This is applied to different loading conditions and in the article the following is discussed in detail: craze growth in front of stationary cracks, crazing behavior during continuous crack growth under quasi-static load as well as during normal and retarded fatigue crack propagation. Also micro-mechanical and molecular models are derived from the experimental results, describing the different modes of crack growth behavior in connection with the crazing process. Thus this article contributes to the understanding of the basic processes involved in the fracture of thermoplastics.
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Abbreviations
- a:
-
Crack length
- a:
-
Crack speed
- da/dN:
-
Crack propagation rate in fatigue
- d:
-
Displacement of one craze surface
- E:
-
Modulus of elasticity
- GI :
-
Strain energy release rate in mode I
- HMW:
-
High molecular weight
- KI :
-
Stress intensity factor in mode I
- KIc :
-
KI at onset of critical fracture
- KIi :
-
KI at onset of slow crack growth
- ΔKI :
-
Stress intensity factor range in fatigue
- Kmax :
-
Stress intensity factor at upper load in fatigue
- Kmin :
-
Stress intensity factor at lower load in fatigue
- LMW:
-
Low molecular weight
- Mw :
-
Weight average molecular weight
- Mn :
-
Number average molecular weight
- NCG:
-
Normal fatigue crack growth
- N:
-
Cycle number in fatigue
- Ne :
-
Final cycle number at crack jump
- n:
-
Fringe number
- n1 :
-
Fringe number of loaded craze
- n0 :
-
Fringe number of unloaded craze
- RCG:
-
Retarded fatigue crack growth
- r:
-
Coordinate
- rp :
-
Plastic zone size
- s:
-
Craze length
- si, se :
-
Initial and final craze lengths between successive crack jumps
- T:
-
Temperature
- t:
-
Time
- Vf :
-
Fibril volume fraction in a craze
- 2v(x):
-
Displacement of elastic-plastic boundary
- 2v:
-
Maximum displacement of the craze zone at the crack tip
- 2vc :
-
2v at fracture
- 2v0 :
-
2v in the unloaded state
- 2vi, 2ve :
-
Initial and final value of 2v between successive crack jumps
- W:
-
Specimen width
- x, y, z:
-
Coordinates
- ε:
-
Strain
- Λc :
-
Extension ratio in a craze
- λ:
-
Wave length of light
- μb :
-
Refractive index of bulk polymer
- μc :
-
Refractive index of a loaded craze
- μ0 :
-
Refractive index of an unloaded craze
- v:
-
Poisson's ratio
- σ:
-
Stress
- σa :
-
Average stress along the craze contour
- σc :
-
Craze stress
- σt :
-
Stress at the craze tip
- τ0 :
-
Primordial thickness of bulk polymer to be fibrillated
- φ:
-
Polar coordinate
- ω:
-
Frequency in fatigue
- ABS:
-
Acrylonitrile-butadiene-styrene copolymer
- DOP:
-
Dioctylphthalate
- PC:
-
Polycarbonate
- PE:
-
Polyethylene
- PES:
-
Polyethersulfone
- PMMA:
-
Poly (methyl methacrylate)
- POM:
-
Polyacetale
- PS:
-
Polystyrene
- PSF:
-
Polysulphone
- PVC:
-
Poly (vinyl chloride)
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Döll, W., Könczöl, L. (1990). Micromechanics of fracture under static and fatigue loading: Optical interferometry of crack tip craze zones. In: Kausch, H.H. (eds) Crazing in Polymers Vol. 2. Advances in Polymer Science, vol 91/92. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0018021
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