"Effect of static pre-loading on fracture toughness of Nicalon fibre glass matrix composite." . "N/A" . . "0921-5093" . "Chawla, K. K." . . . . "RIV/68081723:_____/04:07033154!RIV/2004/AV0/A07004/N" . "Effect of static pre-loading on fracture toughness of Nicalon fibre glass matrix composite."@en . "P(IAA2041003), P(ME 491), Z(AV0Z2041904)" . "Materials Scienes and Engineering A" . "367" . "Nicalon fibre; glass matrix composite; fracture toughness"@en . . "6"^^ . "Koopman, M." . "Boccaccini, A. R." . "0"^^ . "Kulkarmi, R." . . . "0"^^ . "Dlouh\u00FD, Ivo" . . . . . . "2"^^ . "562030" . "Chlup, Zden\u011Bk" . . "RIV/68081723:_____/04:07033154" . . . . "Static fatigue of commercial available unidirectional SiC-fibre reinforced glass matrix composite has been followed by measuring fracture toughness of samples statically pre-loaded at different stresses and times. Pre-load levels were just below the loads corresponding to fracture strength, the (bending) pre-stress being on level 300, 310 and 315 MPa. Three hold times, 25, 50 and 75 h were applied at the stresses. For fracture toughness (KIc) determination a chevron-notch three-point bend test was applied. The method has been found to be the only way to accurately detect and quantify very subtle microdamage on fiber/matrix interfaces caused by static pre-stressing. Despite of the high scatter of the measured KIc values, a decrease in fracture toughness with increasing pre-stress and hold time has been found. A parameter enabling to quantify the cumulative and combined effect of pre-stress and hold time on fracture toughness of the composites has been proposed."@en . . "[E07E80DE5382]" . "Effect of static pre-loading on fracture toughness of Nicalon fibre glass matrix composite." . . "Static fatigue of commercial available unidirectional SiC-fibre reinforced glass matrix composite has been followed by measuring fracture toughness of samples statically pre-loaded at different stresses and times. Pre-load levels were just below the loads corresponding to fracture strength, the (bending) pre-stress being on level 300, 310 and 315 MPa. Three hold times, 25, 50 and 75 h were applied at the stresses. For fracture toughness (KIc) determination a chevron-notch three-point bend test was applied. The method has been found to be the only way to accurately detect and quantify very subtle microdamage on fiber/matrix interfaces caused by static pre-stressing. Despite of the high scatter of the measured KIc values, a decrease in fracture toughness with increasing pre-stress and hold time has been found. A parameter enabling to quantify the cumulative and combined effect of pre-stress and hold time on fracture toughness of the composites has been proposed." . "7"^^ . "17;23" . "NL - Nizozemsko" . . "Effect of static pre-loading on fracture toughness of Nicalon fibre glass matrix composite."@en .