The paper presents some experimental studies on a regular cross-ply laminate of the [(0/90)F]4S configuration. Each layer is VE 11-M vinylester resin (the manufacturer: "Organika-Sarzyna" Chemical Plants, Sarzyna, Poland) reinforced with plain weave carbon fabric of parameters: Style 430, Carbon 6K, substance 300 g/m2, warp/weft 400/400 tex, 3.7/3.7 yarn/cm (the manufacturer: C. Cramer GmbH & Co. KG Division ECC). The orthotropic laminate was produced by the ROMA private enterprise, Grabowiec, Poland, using the vacuum molding technology and the technological parameters developed by ROMA taking into account the VE 11-M material specification. The PN-EN ISO 14129:2000 standard and closely related standards were taken into consideration in experimental studies on the static in-plane shear response by a tensile test of a [+/-45)F]nS laminate. A program of the experiments was focused on testing a rate of a testing machine crosshead and a number of static stress cycles. An influence of these factors on the in-plane shear modulus was investigated. Based on the conducted investigations, the modified experimental procedure has been proposed for determination of the correct value of the in-plane shear modulus and the in-plane shear strength. This procedure concerns the in-plane shear test and contains the following steps: 1. Execution of the initial loading cycle of the triangular shape (linear increase of the crosshead displacement up to 0.55 mm and a linear decrease to zero), at the crosshead rate of v = 2 mm/min) in order to redistribute the residual (technological) stresses in the specimen. 2. A 30' break after the initial loading cycle, in order to perform the reverse creep of the specimen. 3. Execution of the main test, i.e., linear increase of the crosshead displacement at the velocity of v = 2 mm/min until the break of the specimen appears or the limited strain [gamma] = 0.0500 is reached. Determination of the [tau]-[gamma] diagram. 4. Determination of the in-plane shear modulus, G12, based on the [gamma] = 0.0010-0.0020 interval, using the linear regression due to measurement fluctuations. 5. Determination of the in-plane shear strength, R12, equal to the maximum value in the [tau]-[gamma] diagram.
PL
Przedmiotem badań eksperymentalnych jest regularny laminat krzyżowy o konfiguracji [0/90F]4S. Warstwę laminatu stanowi żywica winyloestrowa VE 11-M (producent Zakłady Chemiczne "Organika-Sarzyna" S.A.) wzmocniona tkaniną węglową z przeplotem prostym (producent C. Cramer GmbH & Co. KG Division ECC) o parametrach: Style 430, włókno Carbon 6K, gramatura 300 g/m2, osnowa/wątek 400/400 tex, 3,7/3,7 pasm/cm. Laminat został wytworzony przez przedsiębiorstwo ROMA Sp. z o.o. w Grabowcu z zastosowaniem technologii prasowania próżniowego i przyjętych parametrów technologicznych opracowanych przez ROMA z uwzględnieniem karty żywicy VE 11-M Zakładów Chemicznych w Sarzynie. Przeanalizowano normę PN-EN ISO 14129:2000 oraz normy związane w zakresie badania ścinania statycznego w płaszczyźnie laminatu ortotropowego za pomocą jednokierunkowego rozciągania laminatu [+/-45)tk]4S. Opracowano program badań eksperymentalnych ukierunkowany na zbadanie wpływu prędkości ruchu trawersy maszyny wytrzymałościowej oraz liczby cykli naprężenia statycznego na wyniki pomiarów modułu ścinania w płaszczyźnie laminatu. Na podstawie przeprowadzonych badań zaproponowano modyfikację procedury normowej w celu wyznaczenia poprawnej wartości modułu ścinania oraz wytrzymałości na ścinanie w płaszczyźnie laminatu.
The study presents experimental studies on a regular cross-ply laminate of a [(0/90) F]4S configuration. Each layer is made of VE 11-M vinylester resin (the manufacturer: "Organika-Sarzyna" Chemical Plants) reinforced with aplain carbon fabric (the manufacturer: C. Cramer GmbH & Co. KG Division E CC). The carbon fabric has the following parameters: Styles 430, filament Carbon 6K, substance 300 g/m , warp and weft 400/400 tex, 3.7/3.7 band/cm. Laminate was produced by ROMA private enterprise using the vacuum molding technology and technological parameters developed by ROMA taking into account the VE l J-M material specification. A program of the experimental studies was aimed on statistical analysis of measurement results of the in-plane shear modulus and the in-plane shear strength of the laminate. In investigations, the in-plane shear test was carried out in accordance to the PN-EN ISO 14129:1997 standard [1], but applying the modified procedure that takes into consideration the results of the previous research on the influence of a traverse velocity and of a number of stress cycles on static measurements of the in-plane shear modulus [2]. The mean value, the standard deviation and the two-sided 95 percent confidence interval for the mean value for the investigated quantities have been determined. Practical usefulness ofthe manufacture technology of the laminate was assessed.
The paper presents some experimental studies on a regular cross-ply laminate of the [(0/90)F] 4S configuration. Each layer is VE 11-M vinylester resin (the manufacturer: ,,Organika-Sarzvna" Chemical Plants, Sarzyna, Poland) reinforced with plam weave carbon fabric of parameters: Stvle 430, Carbon 6K, substance 300g/m2, warp/weft 400/400 tex, 3.7/3.7 yarn/cm (the manufacturer: C. Cramer GmbH & Co. KG Division ECC). The orthotropic laminate was produced by ROMA private enterprise In Grabowiec, Poland, using the vacuum molding method and the technological parameters developed by ROMA taking into account the VE 11-M material specijication. The PN-EN ISO 14129:1997 standard [1] and closely related standards [2-9] were taken into consideration in experimental studies on the static in-plane shear response by a tensile test of a [(plus or minus 45)F]nS laminate. A program of the experiments was focused on testing a rate of a testing machine crosshead and a number of static stress cycles. An influence of these factors on the in-plane shear modulus was investigated. Based on the conducted investigations, the modified experimental procedure has been proposed for determination of the correct value of the in-plane shear modulus and the in-plane shear strength.
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