Assessment of damage in GRP laminates by stress wave emission and dynamic mechanical measurements

1977 ◽  
Vol 12 (11) ◽  
pp. 2329-2342 ◽  
Author(s):  
G. D. Sims ◽  
G. D. Dean ◽  
B. E. Read ◽  
B. C. Western
Keyword(s):  
Stress Wave ◽  
Dynamic Mechanical ◽  
Mechanical Measurements ◽  
Wave Emission

scholarly journals Telechelic ionomers studied by light scattering and dynamic mechanical measurements

1996 ◽  
Vol 112 (2-3) ◽  
pp. 155-162 ◽  
Author(s):  
Christophe Chassenieux ◽  
Ragnar Johannsson ◽  
Dominique Durand ◽  
Taco Nicolai ◽  
Pierre Vanhoorne ◽  
...  
Keyword(s):  
Light Scattering ◽  
Dynamic Mechanical ◽  
Mechanical Measurements ◽  
Telechelic Ionomers

scholarly journals Development of a True-Biaxial Split Hopkinson Pressure Bar Device and Its Application

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7298
Author(s):  
Shumeng Pang ◽  
Weijun Tao ◽  
Yingjing Liang ◽  
Shi Huan ◽  
Yijie Liu ◽  
...  
Keyword(s):  
Stress Wave ◽  
Impact Loading ◽  
Split Hopkinson Pressure Bar ◽  
Axial Stress ◽  
Dynamic Mechanical Properties ◽  
Stress Waves ◽  
Hopkinson Pressure Bar ◽  
Dynamic Mechanical ◽  
Split Hopkinson ◽  
Pressure Bar

Although highly desirable, the experimental technology of the dynamic mechanical properties of materials under multiaxial impact loading is rarely explored. In this study, a true-biaxial split Hopkinson pressure bar device is developed to achieve the biaxial synchronous impact loading of a specimen. A symmetrical wedge-shaped, dual-wave bar is designed to decompose a single stress wave into two independent and symmetric stress waves that eventually form an orthogonal system and load the specimen synchronously. Furthermore, a combination of ground gaskets and lubricant is employed to eliminate the shear stress wave and separate the coupling of the shear and axial stress waves propagating in bars. Some confirmatory and applied tests are carried out, and the results show not only the feasibility of this modified device but also the dynamic mechanical characteristics of specimens under biaxial impact loading. This novel technique is readily implementable and also has good application potential in material mechanics testing.

Determining the Fatigue Characteristics of Material on the Basis of Stress-Wave Emission

2019 ◽  
Vol 49 (2) ◽  
pp. 91-96
Author(s):  
A. N. Savel’ev ◽  
E. A. Savel’eva ◽  
D. O. Anisimov ◽  
O. D. Prokhorenko
Keyword(s):  
Stress Wave ◽  
Fatigue Characteristics ◽  
Wave Emission

Changes in the Dynamic Modulus during Thermal Degradation of Polyisoprene Vulcanizates

1980 ◽  
Vol 53 (4) ◽  
pp. 944-949 ◽  
Author(s):  
Shoichiro Yano
Keyword(s):  
Thermal Degradation ◽  
Dynamic Modulus ◽  
Dynamic Method ◽  
Activation Energies ◽  
Time Axis ◽  
Frequency Dependent ◽  
Dynamic Mechanical ◽  
Mechanical Measurements

Abstract Thermal degradation of IR is investigated in air and in N2 by dynamic mechanical measurements. In this dynamic method, the change in the relative dynamic modulus is found to be frequency dependent, but the data at various frequencies can be superimposed upon each other by shifting along the time axis. Changes in relative modulus as a function of time in air and in N2 can be expressed by Equation (1), which contains two exponential terms. The activation energies for k1 and k2 are 84 and 57 kj/mol in air, and 61 and 57 kJ/mol in N2, respectively.

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