PSI - Issue 20

A.A. Kychkin et al. / Procedia Structural Integrity 20 (2019) 185–189 A.A.Kychkin et al / Structural Integrity Procedia 00 (2019) 000–000

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a

b

Fig. 3. Dependence of stress (a) and modulus of elasticity (b) in compression on SiC amount

Impact strength tests showed that impact strength decreases due to the increase of the degree of filling with silicon carbide. It has to do with the emergence of tension centers, which are particles of silicon carbide. In the resin amount they form a participle framework, which increases rigidity of structure and consequently enhances effectiveness of resistance to compression and bending loads.

Table 1. Comparative test results

Modulus of elastic in bending , MPa 3339±107 3257±104 3294±105 3315±106 3493±112 3223±103 3511±112 3359±107

Modulus of elastic in compression, MPa

Stress in compressio n, МPa 109±12 107±11

Impact strength, kJ/m2 3,00±0,2 2,18±0,15 2,43±0,16 2,8±0,16 2,11±0,14 2,0±0,13 1,52±0,10 1,72±0,11

Amount ,SiC mass %

Stress in bending , MPa

0,00 0,25 0,50 0,75 1,00

98±8 85±7 101±8 114±9 82±6 83±7 97±8 83±7

2135±64 1987±59 2129±63 2241±67 2368±71 2063±61 2226±67 2318±69

109±12 109±12 108±11 109±12 109±12 112±13

2 3 5

Analysis of the research findings shows that influence of silicon carbide particles is ambiguous. It's impossible to determine degree of filling, that provides complex increase of properties of epoxy resin. In general there are insignificant changes of properties within the margin of error with the degree of filling to 1 mass%. 3. Conclusions At this stage of the study modification by silicon carbide with its amount 0,75 mass% is of practical interest. The increase of resistance in bending of 16% and the increase of modulus of elastic in compression of 5% are observed. The research findings attest to the need of further study on morphological structure of a modified polymer, its behavior under dynamic loads, modified by silicon carbide.