This paper presents the results for an experimental campaign of in-situ impact during tension-tension fatigue loading open-hole carbon fibre reinforced polymer specimens. High-speed low energy was introduced to specimen with use a canon, which attached testing bench enabling without need remove specimens from test bench. Digital Image Correlation, C-scan and Acoustic Emission were utilized reco...

This study explores the effect of size scaling and stacking sequence on quasi-static tensile behavior [90/0]ns sublaminate-level [90n/0n]s ply-level scaled glass/epoxy laminates. Test results showed that unnotched strengths both specimens were comparable for a given factor, even though suffered extensive delamination between 90n 0n ply blocks. In contrast, open hole (OHT) strength was reduced w...

the methanolic leaf extract of thuja occidentalis was evaluated for possible sedative activities in mice. sedative activity was evaluated by using hole cross, open field, thiopental sodium-induced sleeping time and elevated-plus maze (epm) tests at 200mg/kg and 400 mg/kg.  the extract decreased the locomotor activity of mice in hole cross, open field and epm test and showed the remarkable resul...

In this research, the effects of the rotational speed, feed rate, tool material and lubricants on the tool life and the hole quality are studied in the frictional drilling of the titanium sheets. The friction drilling tests are performed on a CNC milling machine. Furthermore, 5 specimens are selected and their metallurgical structures are studied. The results show thatamong the input parameters...

The performance of a state-of-the-art continuum damage mechanics model for interlaminar damage, coupled with a cohesive zone model for delamination is examined for failure prediction of quasi-isotropic open-hole tension laminates. Limitations of continuum representations of intra-ply damage and the effect of mesh orientation on the analysis predictions are discussed. It is shown that accurate p...

Additive Manufacturing is a technology with high potential since it offers lot of benefits going from lower material waste to flexibility in the component fabrication process. The continuous Carbon Fibre (CF) deposition an interesting approach allows depose CF bundles following different geometries and avoiding limitations current composite manufacturing techniques. Choosing path means also giv...

This paper deals with the mathematical study of failure loads of glass epoxy composite plates with two serial holes subjected to traction force by two serial rigid pins. To evaluate the effect of joint geometry on the failure loads the geometrical parameters such as the edge distance of first hole-to-hole diameter (E/D), the width of the specimen-to-hole diameter (W/D), and the distance between...

The electric arc furnace (EAF) is used to produce high quality steel from steel scraps. The EAF uses plasma arc to generate heat for melting scarp or direct reduced iron (DRI). The liquid metal should be drained from the tap hole. Manual tapping operation of the EAF in the hot environment around the furnace is a potentially dangerous and time consuming task for the workers. Therefore, it is ess...

In this research, the influence of bolt preload on the fatigue strength of 2024-T3 aluminium alloy double lap bolted joints has been studied experimentally and numerically. To do so, three sets of the specimens were prepared and each of them subjected to tightening torque of 1,2.5 and 5 N-m and then fatigue tests were conducted under various cyclic axial load levels. In the numerical method, th...