They get their name because of a small red light on. Sometimes coupon printing. You might not know what I mean when I mention blinkie coupons. Many blinkie coupons come from SmartSource Coupon Machines. Once you print your SmartSource coupon and you have the QR code It will automatically open your browser and tell you everything you need to. Starting April , all lygahameromi.
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Printing from a mobile device smartphone, tablet is not supported. SmartSource has coupon machines locate in grocery stores and you can use them What are coupon blinkies, blinkie coupons, blinkies? P1 material carbon steel can be submitted for a wide range of materials, including low-alloy steels, stainless steels, and nickel-based alloys. Test coupons for welder qualifications are generally either plate or pipe. Groove weld qualifications also qualify for fillet welding but not vice versa. Read full chapter.
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Figure The specimens consisted of a concrete substrate having an FRP composite overlay applied on its upper surface. The FRP composite overlay consisted of glass-fiber-reinforced polyester GFRP fabricated in the laboratory from commercially available components. The composite overlay was 3. During the block casting process, two anchorage bolts These bolts attached the specimen to the test fixture and took up the reaction forces.
During composite overlay fabrication, a loading hinge leaf was inserted into the left end of the composite overlay Figure The testing consisted of applying a vertical force through the loading hinge at the tip of the composite overlay and increasing it under displacement control until a crack started to propagate. The loading was performed in displacement control; hence, the start of crack propagation was accompanied by a sharp decrease in the applied force.
Subsequently, the displacement was kept constant until the crack propagation process was exhausted and the crack was arrested. At this point, the crack length was recorded, measurements were taken, and the loading was resumed. With this method, we were able to grow disbond cracks of increasing lengths between the composite overlay and the concrete substrate. Lawrence T. Henjen Ho, in Comprehensive Composite Materials , Thermoset test coupons for the single-fiber fragmentation test can be fabricated by a casting method with the aid of a silicone RTV eight-cavity mold.
Sprue slots are machined into the center of each dogbone to a depth of 0.
The procedure for fabrication of the coupons is as follows:. Once selected, a filament is mounted in the mold and held in place with a small amount of rubber cement at the end of the sprue. The rubber cement is not in contact with the cavity which contains the grip sections nor the gage length section in the mold. The rubber cement is allowed to dry, and the resin is added with the aid of a disposable pipet.
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The long, narrow tip should be removed so that the resin can readily enter and exit the pipet chamber. Air bubbles are avoided by first degassing the silicone mold and the resin in a vacuum chamber before filling the mold cavities. The assembly is transferred to an oven where the appropriate cure cycle for the fiber and matrix being investigated is completed. After cool-down to room temperature, the mold can be curled away from the specimens parallel to the fiber to prevent fiber damage.
The test specimens can then be stored in a desiccator until ready for analysis. Prior to testing, the coupons should be inspected for defects such as voids, wavy fibers, multiple fibers, etc. The specimens are tested in uniaxial tension, using a microstraining machine Her-rera-Franco et al. This allows the operator to assess the fiber fracture process along the entire gage length of the coupon. A transmitted light polarizing microscope should be configured such that there is one polarizer below and one above the test coupon.
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The fiber diameter is measured using a calibrated eyepiece. Single fiber fragmentation technique apparatus. Fabrication of single fiber fragmentation specimens using a thermoplastic matrix and glass or carbon fiber reinforcement can also be completed with variations in the thermoset procedure as noted below:.
Lay fibers across the rubber gasket and the thermoplastic film. The fibers are held in place by static electricity forces between the fibers and the thermoplastic. Once all the fibers are in place, cut them with a scalpel into 2. This helps to keep the fibers straight during compression of the laminate.
Place a thermocouple over one corner of the thermoplastic. The thermocouple can be held in place by taping it to the gasket material using high-temperature tape. Complete the assembly by carefully applying another sheet of thermoplastic, release film, and aluminum plate on top of the fibers. Enclose this assembly in a bag of high-temperature material include breather cloth that is attached to a vacuum hose, sealing the edges to assure a perfect seal.
Insert the assembly into a dual-platen thermal press. Pull a vacuum on the bagged assembly. Heat the press platens to the desired temperature and place the assembly in between them so that good thermal contact is established but no pressure.
The sample temperature must be monitored and maintained at this temperature to allow the thermoplastic to dry before the assembly is compressed. Increase the temperature of the platens to above the T m of the polymer. Once at temperature, apply a compressive force of Examine the panel and select fibers which are straight. Dogbone type specimens of selected fibers with same dimensions as those specified for thermoset specimens can now be cut out of the sheets. In Introduction to Aerospace Materials , The number of coupon tests performed on a new material can range from several hundred to many thousand, depending on the material itself and its intended aircraft structural application.
A large number of coupon tests are necessary to provide a statistical database on the mechanical properties. This is because many properties, including yield strength, fracture toughness and fatigue life, are sensitive to small variations in the material. Minor differences in the alloy content, microstructure and defects e. When a large number of coupon tests are performed on the same material then the amount of scatter in the mechanical properties is quantified.
For example, Fig. The mean property value is , although the measured properties vary from about 72 to Example of the number and types of coupon and element tests used to evaluate a new composite material for an aircraft structure. Representation of statistical variations in the mechanical properties of materials. Large databases which quantify the amount of scatter in the mechanical properties are essential for safe aerospace design.
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The databases are used to determine the so-called material allowables that are used in design analysis. The material allowables are often given under the headings of A or B. The A basis allowable defines the mechanical property values for materials used in safety critical aircraft structures such as the fuselage, wings and undercarriage. The confidence required in the property values for these materials is critical to aircraft safety. The B basis allowable is less stringent, and is applied to components where material failure does not result in the loss or excessive damage to the aircraft.
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