Effect of types of glass fiber on R-curve behaviour of glass fiber/epoxy DCB laminates with orientation [0°/90°] for layers
- سال انتشار: 1391
- محل انتشار: دهمین سمینار بین المللی علوم و تکنولوژی پلیمر
- کد COI اختصاصی: ISPST10_813
- زبان مقاله: انگلیسی
- تعداد مشاهده: 295
نویسندگان
BS student, Department of Civil Engineering, Ghom University, 5th km Esfehan Road, Ghom, Iran
MS student, Department of Mechanical Engineering, Islamic azad university, Semnan- branch, Iran
چکیده
Delamination is a typical fracture mechanism in fiber reinforced composite laminates occurs due to low interlaminar strength. Some well-known sources of delamination underdifferent loadings are free edges, low and high velocity impact [1]. These damages may reduce the stiffness and strength.Therefore, characterization of delamination resistance based on the fracture mechanics is of great importance in engineering design.In this study, the investigate on types of glass fiber on mode Idelamination resistance behaviour of glass fiber/epoxy laminated composites with an initial delamination between[0°/90°] interface with woven roving and unidirectional glass fiber is experimentally investigated To this end, symmetric double cantilever beam (DCB)specimens of stacking sequences [0°/90°] with two initial crack lengths are used A pronounced R-curve behavior isobserved on stacking sequence due to locating delamination between two similar layers for two types of glass fiber Eight plied DCB test specimens of [0°/90°] stacking sequences are fabricated from glass fiber/epoxy by hand layup method. In the mentioned laminates, the initial crack islocated at the mid-plane and is made by inserting a Teflon film of thickness. A universal testing machine is used to conduct the DCB tests. Mode I tests are performed under thedisplacement control condition. The crosshead speed is set at 3 mm/min to ensure steady crack propagation and recordedeasily. A graph of load (F) versus displacement (δ) is recorded by the tensile machine. Fig. 1 shows procedure of measuring the crack length during the crack propagation. The typical load–displacement curves for two different glass fiber (unidirectional and woven roving) with initial cracklengths are illustrated [2]. At the peak of P–δ curve (P max), the fiber- bridging phenomenon disappears and suddenly drops are observed in the load values in each crack extension (See Fig. 2).کلیدواژه ها
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