The compression tests were conducted to obtain the necessary material properties for the finite element analysis. The ring compression tests were carried out on the hot deformation simulator wumsi of the maxplanckinsti tut in dusseldorf. Failure analysis of thick composite rings under diametral. Ring crush of paperboard rigid support method fiveyear. Determination of friction coefficient by employing the. Ring compression test has been widely used as a test to evaluate the friction condition in metal forming process. Two measurements of the initial gage dimensions of the specimens were taken and averaged to obtain the dimensions that appear in table 2. Compression testing provides data on the integrity and safety of materials, components and products, helping manufacturers ensure that their finished products are fitforpurpose and manufactured to the highest quality. General manufacturer toyota modelyear 1hz hzj75, 80 1989 lcid 4,163cc diesel no. Different lubrication conditions are applied such as zinc. Sponsoring agency name and address national aeronautics and space administration washington, d.
Theoretical and experimental analysis of a ring compression test for ti6al4v titanium alloy. Value of m vary from 0 perfect sliding to 1 sticking. The strength program allows you to evaluate the effects of a number of loading parameters and environmental conditions on the predicted individual case compression strength and on the resulting stacking height of a pallet load. The principle of ring test for given conditions of temperature, strain, strain rate and initial specimen geometry of od. Our top compression rings come in a variety of coatings and four popular styles. Accelerated aging test aging test compression set test compression test corrosion test density and relative density hardness test mold shrinkage orings physical properties relative density rubber rings shrinkage tensile test. To keep ring specimens properly aligned and upright, two vertical guide plates were welded to the two base plates. Contrary to the nonlinear form of the navier law, the linear form, just like.
The ring compression test conducted by this study indicates that the coulomb friction coefficient. With the oil control rings loaded on the piston, use a proper ring installation tool to open the second groove rings with the top mark facing up. The outer and inner diameters of the ring are d0 50. The compression ring test is universally accepted as a perfectly valid method by which determine simply and reliably the adhesion friction factor in a plastic. The test fixture is consisted of two thick plates, one each at the top and bottom of the ring.
Ring compression test provides to a canonical geometrical dimensions, the possibility of finding these coefficients 9. Piston ring rotation within the ring land is a normal design characteristic. Installation of compression rings hastings manufacturing. In this work standard and treated samples of a modified ring geometry made of aa1050 are investigated with confocal microscopy after applying the ring compression test supported by fe analysis. Zircaloy4 cladding hydride reorientation under ring compression test conditions.
A bilinear material model is used in nonlinear fea. Lee and altan 7 applied the upper bound method in the analysis of free ring compression, taking into consideration the barrelling of outer and inner profile of the ring at forming. This profile results in improved combustion gas sealing and improved oil control versus a. Be possible to measure the dimensions of the ring and calculating the value of both friction and the load required to deform the workpiece avitzur 1968, altan 1972. The data produced in a compression test can be used in many ways including. Short span compression sct should replace ring crush rct 1. Ring compression tests were conducted with specimens sampled from highburnup pwr and bwr fuel cladding segments that had been ruptured, oxidized at 1,4051,484k, and quenched in loca. Study on ring compression test using physical modelling.
The process of compression confines and presses a mixture of air and fuel into a small volume within the area of the engines cylinder. The ring compression test is a method for determining a materials flow stress and the friction factor at the diespecimen interfaces during the com. A compression test is a good way to measure the condition of the rings, cylinders, and valves. The ring compression test as simulation test for the investigation of.
Since the early work of kunogi, kudo and hawkyard and johnson, ring compression tests have been widely used for evaluating friction and lubrication effects in bulk metal forming. Closure to discussions of the validity of mathematical solutions for determining friction from the ring compression test 1970, asme j. Used fuel disposition campaign phase i ring compression. The ring compression test is reexamined and the validity of the test method is discussed. Ring compression ductility of highburnup fuel cladding.
The trouble with ring crush and how sct and autoline save. Short span compression is an easier, quicker and cheaper testing method, is available in automated systems, works for all basis weights rct does not track basis weight. In this study, the generalized navier law, where the interface shear stress. Fe simulation based friction coefficient factors for metal. The compression ring test is universally accepted as a perfectly valid method by which determine simply and reliably the adhesion friction factor in a plastic deformation process. The ring compression test is a commonly used standard friction test. As illustrated in figure 4, the compression ring location may have a direct bearing on the dynamic seal pressure check. E1097 epdm epr datasheet test report oring suppliers. The samples were then placed between the compression anvils to commence uniaxial compression testing fig. Pdf zircaloy4 cladding hydride reorientation under ring. The ring compression test is considered one of the most reliable ways to obtain the friction shear factor existing in a plastic deformation process, particularly in. Used fuel disposition campaign phase i ring compression testing of highburnup cladding december 31, 2011 v summary the purpose of ring compression testing is to generate data to support the development of the technical basis for extended storage and transportation of highburnup fuel. The ring compression test is not established as a standard test in which they are defined exhaustively the conditions for its application, it is a simple compression operation by forging by parallel flat plates on a piece geometry ring through which be possible to calculate the friction coefficient according to the change of the inner diameter. Figure 2 shows calibration curves which were recommended by male and cocroft, for the ring 6.
An oring, also known as a packing, is a flexible gasket in the shape of a loop. This common top ring profile has a convex face, enabling a higher ring face contact pressure, and can be symmetric or asymmetric. Buckling of stiffened cylinders in axial compression and. The flow curve of the material, a single block of aa6061t651 aluminum alloy, was obtained by means of compression tests carried out on solid cylinder specimens.
Fea view of compression of an oring or deformation of an round profile under compression. The validity of mathematical solutions for determining friction from the ring compression test a commentary has been published. The ring compression test is, therefore, a compression test which incorporates a friction measurement. Study on ring compression test using physical modeling a. Pdf theoretical and experimental analysis of a ring. This technique utilizes the dimensional changes of a test specimen to arrive at the magnitude of friction coef. Using a curve fit for ringcompression test rct data to dihdildetermine the ductiletobi l iibrittle transition identifying the appropriate number of repeat tests to support an analytical limit. This process presses together all the molecules under very high pressure. Experimental procedure to carry out the ring compression test, the standard ring specimen ratio of 6. Study on ring compression test using physical modeling.
Lay the rings out in groups of top rings and second rings. Evaluating ring compression test results for developing. Astm d1414 15 standard test methods for rubber orings. Pdf friction is a major factor in determining the characteristics ofmetals as they are forged. Any engine, whether gasoline or diesel, requires compression to operate.
For the compression rings, the slot marked 1 is the top ring and 2 is the second ring. Interface friction factor is the ratio of interface shear strength to yield stress in shear. Analysis of ring compression test by upper bound theorem. It is important to perform a compression test every time a tuneup is done, as part of preventative maintenance. If your engine is running rough or is lacking power. It is concluded that the ring compression test has been shown to be valid only in principle and in relation to other methods, which are not independently accurate and are based on similar assumptions. Pdf finite element modeling of ring compression tests on. Plasticine, which is used as modelling material, has the static and dynamic characteristics similar to those of most metals and alloys at increased temperatures, so it is used only for modelling of hot bulk forming processes. Teledyne continental aircraft engine service bulletin. Regularand efficient lubrication is one of the best.
The stack ring compression test srct is proposed in order to solve the lack of a tribological evaluation experimental test in sheet. Pdf analysis of ring compression test for determination. Tribological evaluation through stack ring compression test. Uniaxial tension and compression testing of materials. After the model is established, validation tests are conducted via the influence of poissons ratio on the ring compression test. Therefore, we suggest you complete the test in the opposite direction if readings are below prescribed limits. Pdf determination of friction coefficient by employing the ring.
Performing organization name and address nasa langley research center hampton, va. Ring compression test is the only method to obtain a friction factor, however the surface expansion ratio of ring compression test is only between 2 and 4. Pdf analysis of ring compression test for determination of. Presentation for a general technical audience, sponsored by lorentzen and wettre usa. Compression test how to do it what can it tell you. A compression test reveals the condition of your engines valves, its valve seats, and piston rings and whether these parts are wearing evenly. Value of m in ring compression test is determined through calibration curve, plotted between percentage change in inner diameter vs percentage reduction in. H the deformation of internal diameter of ring may be calculated as a unique function of interfacial friction. The trouble with ring crush and how sct and autoline save the day roman popil, ph. The ring compression test is considered one of the most reliable ways to obtain the friction shear factor existing in a plastic deformation process. Ring compression test ring compression test group 3 what. In a ring compression test, the inner diameter of the ring increases in the same manner as a solid section when the friction coefficient is zero, whilst the inner diameter of the ring would decrease when the friction. Finite element modeling of ring compression tests on postquenched single side oxidized zirconiumbased alloys loca conditions.
581 615 714 189 895 1371 657 471 764 124 425 505 442 973 1111 609 745 941 176 114 1309 754 569 229 1241 1409 1259 1087 255 38 590 306 17 717 1288 1100 830