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190 Costică Atanasiu et al. γ= ε (3) instr . The measurements were performed with N2322/N2314 and P3 Vishay recording Wheatstone electronic bridges, and the shear characteristic data were used for building the curves shown in Fig. 4 and Fig. 5. The slopes of that curves are the shear module of the chromoplastic material. The shear module G=1241MPa (from the first curve) and G=1072MPa (from the second curve) was obtained after a statistical processing of data. Fig. 4 – The shear characteristic obtained from data supplied by N2322/N2314. Fig. 5 – The shear characteristic curve obtained from data supplied by P3-Vishay electronic bridge. Table 1 Test machine crosshead movement near the limit values of the applied load Crosshead Crosshead The limit Specimen movement near the maximum Maximum force, N movement near the elasticity force of the elasticity force, mm limit, mm domain, N 1 2.9475 4459 2.2762 3891 2 2.6363 4296 1.8500 3501 3 2.7812 4336 2.2150 3930 4 2.6325 4416 1.9712 3820
Bul. Inst. Polit. Iaşi, t. LVIII (LXII), f. 4, 2012 191 The shear stress state in the symmetry notch section was studied on four specimens. In Fig. 6 is drawn the variation of the crosshead position, which load the fixture and the specimen, in respect with the force, for one of the specimens. The Table 1 contains the most important values of the force and the movement of the crosshead for all specimens. In Table 2 are listed the maximum shear stress for the tested chromoplastic material. These values are slightly affected by imperfections of specimens processing, especially in the notch angle, notch tip radius, notch symmetry in respect with the longitudinal axis processing. Load [kN] Table 2 Maximum shear stress in the pure shear specimens Specimen Sectional area mm 2 Maximum load, N Maximum shear stress, MPa 1 126.25 4462 35.34 2 126.50 4297 33.97 3 126.05 4336 34.40 4 125.44 4416 35.20 5 4.5 4 3.5 3 2.5 2 1.5 1 0.5 0 0 2 4 6 8 10 Deformation [mm] Fig. 6 – The test machine crosshead movement in respect with the load force applied to the specimen. The same appearance fracture of chromoplastic material specimens also can be found to the graphite polycrystalline specimens (Manhani et al., 2007).
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