For each material, all samples were WarningThe explanations of r and R Request Research The principles of Two test results shall be judged not equivalent if they differ by Two tests results shall be judged not equivalent if they differ by more than the r value for Keywords that material. Mandatory Information. The correction chart to be de- scribed is principally the left half of Fig.
Some manu- facturers supply windage and friction correction charts for their equipment. The energy losses designated as A or B are described in For convenience, place the free hanging reference point on the right end of the abscissa with the angular displacement increasing linearly to the left.
The abscissa is referred to as Scale C. Although angular displacement is the quantity to be represented linearly on the abscissa, this displacement is more FIG. This yields a nonlinear Scale C with indicated pendulum energy increasing to the right. This accordance with instructions in It is assumed here A2.
This correction must be read on the energy scale, EM, appropriate for the pendulum used. Nonmandatory Information. These measurements could also be made using a comparator if available. NOTE X1. It is preferable that each laboratory standardize on one microscope and one magnification. It is not necessary for each laboratory to use the same magnification because each microscope and camera combination have somewhat different blowup ratios. Focus the microscope so the most distinct of the Filar scale is visible.
This task is accomplished by first setting a mechanical compass at a distance of 0. Place the notched specimen on top of the slide. Focus X1. Move the specimen around using the platform paper, finding its approximate center, and marking this point.
Label this line zero the bottom of the viewing area. Take a picture of the notch. Draw a second line perpendicular to the first line through this center point. Label this line From the center X1. Label the line Position the Draw another line at Tape the picture down to the paper. Point I see Fig. Using template for determining notch angle Fig. Rotate the picture so the notch see Fig. These intersections are called 1a that the notch tip is pointed towards you.
Position the center and 1b. Using of the template with the right side straight portion of the notch. Point 1a as the reference point, draw an arc 2a above the Check the left side straight portion of the notch to ensure that notch, draw a second arc 2b that intersects with arc 2a at this portion falls between the 44 and 46 lines. If not, replace Point J. Draw a line between I and J.
This establishes the the blade. If the. J 2 ftlbf. It shall X2. It is a machinists level if a satisfactory reference surface is recommended that the impact tester be bolted to a base having available, or with a plumb bob. Level the machine to within. The upper end of the oil line on the striking edge is the center of strike. Measure the change in vertical height of the X2. This vertical fall distance is adjusted by varying 6.
Readjust the shaft bearings or pointer will just maintain its position anywhere on the scale. Friction washers with glazed surfaces shall be replaced X2. Friction washers shall be on either side of mm 0. The last friction washer installed shall be shaft.
This arm is sometimes bent by allowing the pendulum to backed by a heavy metal washer. Pressure on this metal washer slam against the catch when highcapacity weights are on the is produced by a thin bent spring washer and locknuts. If the pendulum. Place a thin oil film, ink or dye on the pendulum capacity on the first swing.
If the reading is higher striking edge of the pendulum and let the striking edge rest than this, the friction in the indicating mechanism is excessive gently against the bar. If the striking edge is correctly making or the bearings are dirty.
To clean the bearings, dip them in contact with the specimen, a thin line of oil, ink, or dye will be grease solvent and spin dry in an air jet. Clean the bearings transferred across the entire width of the bar. Oil very lightly with X2. A reproducible method of position, the energy reading must be within 0.
Allow the other end of this bar to rest at the center of a load An end play of 0. Subtract the weight of the bar from the 9. The X2. Extra weight required weight for that pendulum capacity. If weight must be added to the pendulum will increase available energy of the added or removed, take care to balance the added or removed machine. This weight must be added so as to maintain the weight without affecting the center of percussion relative to the center of percussion within the tolerance stated in 6.
The effective length must be edge, m ft see X2. The specimen is mounted horizontally and supported unclamped at both ends. Note 3—Caution must be exercised in interpreting the results of this test method. This test method requires specimens to be made with a milled notch see Note 2. Or refer product link: Subscribe to Instron News! Historical Version s — view previous versions of standard. Izod Tests on plastics, ceramics, glass, etc.
Moreover, manufacturers of the equipment are permitted to use different lengths and constructions of pendulums with possible differences in pendulum rigidities resulting see Section 5. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Note 4—This standard resembles ISO in title only. Note 1—The machines with pendulum-type hammers have been standardized in that they must comply with certain requirements including a fixed height of hammer fall, which results in a substantially fixed velocity of asttm hammer at the moment of impact.
The toss energy, or the energy used to throw the free ends of the broken specimen, is suspected to represent a very large fraction of the total energy absorbed when testing relatively dense and brittle materials. The notch produces a stress concentration which promotes a brittle, rather than a ductile, fracture.
For specimen preparation we suggest the use of either our Motorized Notchvis or Automatic notcher, which together with the correct knife will allow the user to notch their samples correctly, according to the test standard. Loadframe, pendulum 1J, 2J, 4J, 5Jsupporting vice jaws, specimen centering plate, spanner, power cord, manual etc. The beam arm is supported by a self indexing mechanism which is released by the operating lever.
Next Checking d see if you are a returning visitor…. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
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