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The mechanical behaviour of polystyrene under pressure

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Abstract

Tensile deformation of polystyrene carried out under pressure up to 4 kbar has shown that the pressure-transmitting fluid (silicon oil) acts as a stress crazing and cracking agent. Unsealed specimens showed a brittle-to-ductile transition at 2.95 kbar, while specimens sealed with Teflon tape and rubber showed the same transition at only 0.35 kbar.

Analysis of the stress-strain curves for the sealed specimens indicated that the pressure dependency of the craze initiation stress differs from that of shear band initiation stress. The brittle-to-ductile transition occurs when the initiation stresses of both processes become equal.

The principal stress for craze initiation showed almost no pressure dependency, suggesting that crazes initiate when the principal stress level of the tensile specimen reaches a critical value irrespective of the applied hydrostatic pressure. Similarly, no pressure dependency was observed for the principal ductile fracture stress. The pressure dependency of yield stress agreed well with a non-linear pressure dependent von Mises yield criterion.

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Abbreviations

P :

pressure

σ T :

observed tensile stress

σ ci :

craze initiation stress

σ y :

upper yield stress

σ f :

fracture stress

σ 1 :

the first principal stress

σ ci 1 :

principal craze initiation stress

σ f 1 :

principal fracture stress

Τ max(P):

maximum shear stress at pressureP

Τ 0 :

maximum shear stress at atmospheric pressure

Τ oct(P):

octahedral shear stress at pressureP

Τ′ 0 :

octahedral shear stress at atmospheric pressure

σ m :

mean normal stress

T :

tensile yield stress at atmospheric pressure

C :

compressive yield stress at atmospheric pressure

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Authors and Affiliations

  1. Departments of Macromolecular Science, and Metallurgy and Material Science, Case Western Reserve University, Cleveland, Ohio, USA

    K. Matsushige, S. V. Radcliffe & E. Baer

Authors
  1. K. Matsushige
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  2. S. V. Radcliffe
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  3. E. Baer
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Matsushige, K., Radcliffe, S.V. & Baer, E. The mechanical behaviour of polystyrene under pressure. J Mater Sci 10, 833–845 (1975). https://doi.org/10.1007/BF01163078

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