The curing oven and heat bonder uses a vacuum bag to consolidate the plies and to provide a path for air and volatiles to escape. Boron prepreg tape with an epoxy resin is most often used for this application. A layup is a one-handed shot made from near the basket. More plies of fabric and resin are added and the process is repeated until all plies are impregnated. This layup is more commonly known as the finger roll. Many high-strength prepregs in use today are no-bleed systems. Objectives: Students will be able to Demonstrate the composite layup process Explain the role of matrix and resin Indicate the ply orientation of each ply on the trace sheet. ±45°, 0°/90°, ±45°, 0°/90°, the last type that is used is called the over hand shot. This technique is used for solid laminate edges of honeycomb panels. This range of values is determined by the orientation of the plies to the applied load. Prepare the prepreg repair plies in a controlled-temperature environment and bring them to the repair area immediately before using them. Typical layup form involves grasping the ball with two hands, raising it in front of your face and banking it off the backboard, which all occurs while you’re in motion. This method is preferred for tight-knit weaves and when near optimum resin-to-fiber ratio is required. Some wet layup resins use an elevated temperature cure and have improved properties. A putback of a missed shot is also technically a layup. 90° to zero is also called the fill direction. Tristan Jass Recommended for you. [Figure 9]. A 2-inch strip of breather cloth is placed around the repair or part (edge breather). Both types of glaciers form through the slow accumulation and compaction of snow into dense glacial ice. - pull-up jump shots off the dribble (e.g. Layups can be broadly categorized into two types: the underarm and the overarm. For wet layup repair, impregnate the fabric with resin. During the wet layup process, a dry fabric is impregnated with a resin. The breather allows the air to escape. This method is commonly used with parts that have been filament wound, because some of the same rules for application apply. Too much or too little resin affects the strength of the repair. Weigh the fabric to find the amount of resin mix that is necessary to impregnate the material. Laminates cured at room temperature using typical wet layup do not exhibit the same degree of distortion due to the much smaller thermal stresses. The player then explodes off the ground and shoots a left-hand layup straight up in the air. You’ll typically shoot layups from very close range after dribbling to the basket, or taking a pass near the hoop. Room temperature cure repairs can be accelerated by the application of heat. Your hand? The underarm layup involves using most of the wrist and the fingers to 'lay' the ball into the net or off the board. There should only be three or four dribbles total when going to the elbow and back. The maximum time allowed for material at room temperature before the material cures is called the mechanical life. Use a piece of thin plastic, and trace the size of each repair ply from the damaged area. Remove this trapped air by covering the prepreg with a perforated release film and a breather ply, and apply a vacuum bag. When an autoclave is used for curing parts, make sure that the pressure in the autoclave is relieved before the door is opened. Allow 2 minutes for the air to be removed from the fabric. Have both feet hit the ground at the same time. Consult the maintenance manual to determine if bleeder plies are required for the repair. Warp is the longitudinal fibers of a fabric. The first step (with the left foot) is long and the second step (with the right foot) is short. Honeycomb sandwich assemblies commonly use a secondary bonding process to ensure optimal structural performance. If usage is small, a chest-type freezer may suffice. Shot of of 1 foot, Lay up. The motion and one-handed reach distinguish it from a jump shot. Autoclaves, curing ovens, and heat bonders can be used to cure the prepreg material. Layups utilize the backboard by bouncing off of it before going into the net. Unlike metal repairs in which the materials are premanufactured, composite repairs require the technician to manufacture the material. A vacuum bag can be used to consolidate the plies and to provide a path for air and volatiles to escape. Because the strength design requirement is a function of the applied load direction, ply orientation and ply sequence must be correct. You are shooting the ball in a hook motion. These are also referred to as "Power Layups." ... A layup in basketball is a two-point shot attempt made by leaping from below, laying the ball up near the basket, and using one hand to bounce it off the backboard and into the basket. A vacuum is applied and a squeegee is used to remove air and excess resin to the edge breather. Lay out the repair plies on a piece of fabric and impregnate the fabric with the resin. In the co-bonding process, one of the detail parts is precured with the mating part being cured simultaneously with the adhesive. With all that goes on around you during a basketball game, that activity level increases ten-fold as you get closer to the basket. Figure 7 presents examples of the effects caused by nonsymmetrical laminates. Vacuum bag molding is a process in which the layup is cured under pressure generated by drawing a vacuum in the space between the layup and a flexible sheet placed over it and sealed at the edges. Use a brush or squeegee to thoroughly wet the fabric. If you get this type of shot down, then you can work on practicing the other types of shots. Most wet layup processes have a room temperature cure but extra heat, up to 150 °F, are used to speed up the curing process. There is no need for a release film because there is no bleeder/breather cloth on top of the repair. With only two balls on each end, this is a much more difficult goal to make than if every player has a ball. A cure cycle is the time/temperature/pressure cycle used to cure a thermosetting resin system or prepreg. Inside hand lay-up: The inside hand lay-up is a great move to use when there is a defender right near you, or trailing closely to you as you drive to the basket. Switching. Other times, the repair is located on the end of a large component that must have a vacuum bag wrapped around the ends and sealed all the way around. It results from personal contact between two opposing players. A vacuum bag will be used to consolidate the plies and to bleed off excess resin and volatiles. At lower temperatures. Do not mix large quantities of quick curing resin. Air enters into the mixture if the resin is mixed too fast. The mechanical life is measured from the time the material is removed from the freezer until the time the material is returned to the freezer. A typical co-cure application is the simultaneous cure of a stiffener and a skin. A breather and vacuum bag are installed to compact the prepreg plies. The first one is the normal layup which coaches teach you first when you start playing basketball. The traditional bleedout using a vacuum bag technique places a perforated release film and a breather/bleeder ply on top of the repair. Thermocouples are placed near the repair, and they provide temperature feedback for the heating device. This film should be the same size or larger than the first piece. Materials that are stored incorrectly can begin to cure before they are used for a repair. The vacuum bag is taped in place with tacky tape and a vacuum port is placed through the bag to create the vacuum. According to healthcare professionals one is more accurate than the other when it comes to negative results. A piedmont glacier is a type of alpine glacier formed where two or more alpine glaciers meet at the base of a valley system. A sheet of solid release film (no holes) is placed on top of the prepreg and taped off at the edges with flash tape. Epoxy resins, like all multipart materials, must be thoroughly mixed. [Simple Scoring Moves] - Duration: 8:57. The operator must keep records of the time in and out of the freezer. Place a piece of solid parting film on the table. Too many bleeder plies can result in a resin-starved repair. All prepreg materials are cured with an elevated temperature cure cycle. Layups. Layups can be broadly categorized into two types: the underarm and the overarm. Most heating devices use a programmable computer control to run the cure cycles. Place a second piece of solid parting film over the fabric. Many resin systems used with wet layup cure at room temperature, are easy to accomplish, and the materials can be stored at room temperature for long period of times. If these types of materials need to be shipped, place them in special containers filled with dry ice. Secondary bonding utilizes precured composite detail parts, and uses a layer of adhesive to bond two precured composite parts. There's no excuse for having just one type of layup, especially since STACK's series about basketball layups has already taught you the Overhand Layup, Underhand Layup, Power Layup, Backhand Layup… Two lines. This also limits the time out of the freezer for a big roll. Lay-ups. Feet are perpendicular to the baseline, both hands on the ball until the release. Copy the repair ply information to a piece of repair material that is large enough to cut all plies. In order to minimize any residual thermal stresses caused during cure of the resin, it is always good practice to design a symmetrical, or balanced, laminate. In general, wet layup properties are less than properties of prepreg material. It is an essential skill for basketball players to master, because nearly all of the other types of layups you'll learn in this series utilize an underhand motion. Co-curing often results in poor panel surface quality, which is prevented by using a secondary surfacing material co-cured in the standard cure cycle or a subsequent fill-and-fair operation. The autoclave uses vacuum and positive pressure to consolidate the plies and to provide a path for air and volatiles to escape. Block out all that is goin… The only way to determine what type of stroke you may be having is to seek medical attention. the first two players from each end start the left-handed speed dribble and shoot the left-handed lay-up. After the fabric is impregnated, cut the repair plies, stack in the correct ply orientation, and vacuum bag. There are four main methods that are used in order to gauge the level of an athlete’s motor skill. The warp is the high-strength direction due to the straightness of the fibers. Basketball features constant motion, and contact between opposing players is unavoidable, but significant contact that is the fault of illegal conduct by one opponent is a foul against that player. When we say "finishing", that means the player is going to the basket and finishing with some type of shot. The strength and stiffness of a composite buildup depends on the ply orientation. Muscular Strength Exercises: Example, Types, and Benefits 3 / 5 ( 2 votes ) If you are new to starting muscular strength exercises, you may be faced with questions such as where to start, how many times to practice, and how to do it. Remove the fabric and cut the repair plies. You dribble up to the ring and place it on the box above the ring on the board to convert the shot. Regular: ... Keeping two hands on the ball and jumping off of two feet keeps the player in control and in a stronger, more balanced position. The freezer must not be of the automatic defrost type; the auto-defrost cycle periodically warms the inside of the freezer, which can reduce the shelf life and consume the allowable out-time of the composite material. The oven temperature and the part temperature can be substantially different if the part or tool acts as a heat sink. Bank Shot. The underarm layup involves using most of the wrist and the fingers to 'lay' the ball into the net or off the board. Free Throw. Your arms? Room temperature cure wet layup repairs do not restore either the strength or the durability of the original 250 °F or 350 °F cure components and are often used for wet layup fiberglass repairs for noncritical components. The disadvantage of room temperature wet layup is that it does not restore the strength and durability of the original structure and parts that were cured at 250 °F or 350 °F during manufacturing. You will not be able to shoot a reverse layup like Michael Jordan if … These methods include the three stages of learning, types of skills, types of practice and types of feedback (See Appendix 3). The oven or autoclave air temperature probe that measures oven or autoclave temperature is not always a reliable device to determine part curing temperature. Types of Layups. Some resin systems require storage below 40 °F. Smoke can burn or poison you when the resin overheats. The handling life is shorter than the mechanical life. Layups. The vacuum-assisted impregnation method is used to impregnate repair fabric with a two-part resin while enclosed inside a vacuum bag. In this sequence, the first layer of reinforcing fabric completely covers the work area, followed by successively smaller layers, and then is finished with an extra outer layer or two extending over the patch and onto the sound laminate for some distance. High quality parts can be made inexpensively using shrink tape. Cure prepregs at an elevated cure cycle; the most common temperatures used are 250 °F and 350 °F. The prepreg material is sticky and adheres to other plies easily during the stack-up process. [Figure 5]. bank shots). The holes in the release film allow air to breath and resin to bleed off over the entire repair area. All frozen prepreg materials need to be stored in moisture-proof bag to avoid moisture contamination. Slowly sweep the resin from the center to the edge of the fabric. 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