Strength of materials

Xu Lanying et al. discussed the conductive heating method applied to small hole drilling[16-18], Heating cutting is a green cutting technology. Material is being heated to appear softening phenomenon, so the material hardness decreases or material yield strength decreases, then its flow stress decreases, which reduces the shear resistance of the material, thereby the cutting process will become smooth, it can obtain the perfect surface roughness which is equivalent to the grinding, and no…

3, 4, 5). The replacement of cementitous materials by crushed quartz filler improves rheology considerably, expressed by the consistent reduction of water content while maintaining a minimum flow of 120-125 mm for workability. The amount of reduced water is proportional to the increase…

with a wedge. The one in the lab was an MTS 647 Hydraulic Wedge Grip and an 810 Material Test System. The specimens had strain gages with a Wheatstone bridge to collect data such as time, distance, load, axial strain, and transverse strain in volts which was converted into pounds per force (lbf), pressure (psi), and etc. for data analysis. From the strain gages, evidence can support how and when the specimen material failed under the stress being applied to the specimen. The test would extend…

nonpathogenic aerobic bacteria in a culture medium containing carbon and nitrogen sources can be promising biodegradable nanofibers for composite materials because of their excellent mechanical properties [1]. Although BC is chemically identical to plant-based cellulose, it exists in extremely pure form and does not contain any hemicellulose, lignin, pectin or wax materials [2]. In addition, it has higher crystallinity, degree of polymerization, specific surface area, and significantly higher…

temperatures. Stretch forming is a method that combines controlled tension and bending of sheet material around dies to produce accurately contoured parts. It is extensively used in the aerospace industry to form large sheet panels of mild curvature, e.g. the leading edge of a wing. A commonly used material for aircraft skins is the heat-treatable aluminum alloy AA 2024. Possible failure modes during forming of this material are necking, wrinkling, $L\ddot{u}$ders lines or orange peel. In order…

(2013), concrete made from 100% recycled coarse aggregate can achieve high compressive strength since large amount of cement to be added, which is therefore not an economical proposition. Still according to the author, concrete made with 50% or 100% of recycled coarse aggregates requires a reduction of 4% to 10% of the ratio a / c of 5% to 10% more cement than the conventional concrete to give it same compressive strength at 28 days of conventional concrete. For the lightweight concrete…

ternary system (Series 3, 4, 5). It is obvious that the replacement of cementitous materials by crushed quartz filler improves rheology considerably, expressed by the consistent reduction of water content while maintaining a fixed flow of…

used quite frequently in a variety of construction applications. Not only was the material found to be durable and versatile, it was also a very cost-effective solution, and so its use was quite prolific in the installation of insulation, floors, ceilings, etc. Today we know that asbestos poses a very serious health concern, and so it is no longer used in modern day construction applications. Unfortunately, this material continues to exist in many of older structures found all throughout…

IZOD Impact Test of Notched Polymer Introduction The IZOD impact test is a method used to determine the impact resistance of materials. The main objective of this experiment is to measure the impact strength of three specimens’ material by measuring the amount of the energy required to cause the material to fracture, using Avery Denison 6709 IZOD impact tester. Materials and Methods Apparatus: Three specimens with a machined 45° notch (V-Notch) at room temperature {Polycarbonate, Polyamide…

Abstract: The study investigated the workability, and compressive strength properties of the concrete produced by replac-ing 5%, 10% and 15% by weight of ordinary Portland cement with Sawdust Ash (SDA). Slump test was carried out on the fresh concrete and compressive strength test on hardened concrete. The concrete cubes were tested at the ages of 3, 7, 14 & 28 days. The results showed that Sawdust Ash is good with use in cement. The slump decreased as the Sawdust Ash content increased…