AHX800 High Elongation Extensometer Manual Title Additional Information Product Manual be certain.
Copyright information © 2011 MTS Systems Corporation. All rights reserved. Trademark information MTS is a registered trademarks and MTS Criterion and MTS Insight are trademarks of MTS Systems Corporation within the United States. These trademarks may be protected in other countries. Proprietary information Teflon is a registered trademark of E. I. du Pont de Nemours and Company.
Contents Introduction 5 Functional Description Specifications 6 7 Installation 9 Unpacking the Extensometer 10 Installing the AHX800 onto an MTS Criterion Frame 11 Operation 15 Setting up a Test Running a Test 16 18 Maintenance 19 Replacing Spare Parts 20 AHX800 High Elongation Extensometer Product Manual Contents 3
Introduction The AHX800 High Elongation Extensometer is designed for testing high elongation applications of elastomer materials such as latex, silicone, rubber, polyurethane, and other similar materials. It is ideally suited for testing dog-bone elastomer specimens per ASTM D412 and ISO 37 specifications.
Functional Description Functional Description The AHX800 High Elongation Extensometer is designed to operate at temperatures from 5 to 40°C. The key part of the extensometer is an optical encoder. The movement of the extensometer arms makes the optical encoder rotate. The encoder send pulses to a circuit where the pulses are converted for use by the controller. Optical Encoder Arms Frame Assembly (all other components) The two arms of the extensometer are attached to the specimen.
Specifications Specifications PARAMETER SPECIFICATION Usable travel 800 mm (31.5 in) Gage lengths 10 - 125 mm (0.375 - 5 in) Measurement resolution 0.004 mm (0.00016 in) Maximum arm opening 40 mm (1.57 in) Knife edges Flat Round Rubber Sharpened Knife attachment method Adjustable mechanical spring Weight Approximately 9.5 kg (20.
Specifications 815 mm (32.1 in) 1070 mm (42.1 in) Dimensions 174 mm (6.
Installation This section describes how to install the AHX800 High Elongation Extensometer. Contents Unpacking the Extensometer 10 Installing the AHX800 onto an MTS Criterion Frame 11 The following hazards apply to all the installation procedures. WARNING The extensometer electronics are sensitive to making electrical connections with electrical power turned on. Making electrical connections with power applied can cause damage to the extensometer and/or other electronics.
Unpacking the Extensometer Unpacking the Extensometer 1. Unpack the high elongation extensometer and place it upright on a flat surface. 2. Loosen the two locknuts on the right-side cover of the high elongation extensometer, and then remove the right-side cover. 3. Unscrew the collar clamp on the bottom of the optical encoder assembly and slide it to the bottom of the shaft. Collar Clamp 4.
Installing the AHX800 onto an MTS Criterion Frame Installing the AHX800 onto an MTS Criterion Frame 1. Lower Test Area Installation Compression Spring Pin Extensometer Inner Hexagon Hang Pin Screw Cantilever Round Axis Lower Test Area Assembly Diagram A. The cantilever varies from different models; the basic shape is shown as above. B. Align the round axis and hang pin in the cantilever with the center hole and the middle hole in the bottom plate of the extensometer. C.
Installing the AHX800 onto an MTS Criterion Frame 2. Upper Test Area Installation Cantilever Round Axis Hang Pin Compression Spring Top Plate Pin Inner Hexagon Extensometer Screw Upper Test Area Assembly Diagram 12 Installation A. The cantilever varies from different models; the basic shape is shown as above. B. Align the round axis and hang pin in the cantilever with the center hole and the middle hole in the top plate of the extensometer. C.
Installing the AHX800 onto an MTS Criterion Frame 3. Connect the cable between the AHX800 board and the MTS Criterion controller; one end of the cable is an RJ45 and the other end is a 15 pin D connector.
Operation This section describes how to use the AHX800 High Elongation Extensometer. Contents Setting up a Test Running a Test Component identification 16 18 The following figure identifies the components referenced in the following procedures.
Setting up a Test Setting up a Test To set up a test for a specimen: 1. Select a knife edge. Choose a knife edge based on the type of specimen which will be tested. The nature of the specimen material (surface quality, thickness, and so on.) determines the type of knife edge to use. The knife edges are secured with screws to the upper and lower arms. 2. Adjust the gage length. A. Loosen the adjustment rod screw. B. Place the appropriate wedge (desired gage length) between the knife edges. C.
Setting up a Test 4. Adjust the contact to the specimen. The amount of clamping force on the specimen can be adjusted with the knurled knobs of the upper and lower arm. This step must be done after the specimen is installed. The clamping force should be adjusted when the specimen type is changed. WARNING Displacement limits on your test system can restrict the actuator movement to a specified range. Failure to establish upper and lower limits can damage the extensometer.
Running a Test Running a Test Before you start running a test, be sure to complete the procedures in “Setting Up for a Test”. 1. Ensure the extensometer arms are open. 2. Insert a specimen into the grips. 3. Close the extensometer arms. 4. Perform the test. 5. When the test is complete, open the extensometer arms. Arms Closed Note 18 Operation Arms Open The crosshead return can be done with the arm open (the Teflon slide reduces friction between the arms and the cam).
Maintenance This section describes how to maintain the AHX800 High Elongation Extensometer. The serial number of the extensometer can be viewed at the base of the right side of the high elongation extensometer chassis. Routine maintenance Cleaning the guide column Routine maintenance consists of visually inspecting the following: • Check the surface quality of the knife edges. • Remove dust and dirt from the assembly. Take off the left side of the assembly. Clean the guide column with a soft duster.
Replacing Spare Parts Replacing Spare Parts The topics on the following pages describe how to replace the spare parts. See the following figure for component identification. Leaf Arm Teflon Slide Clamping Force Spring High Energy Spring Knife Component Identification Knife edges 1. Remove the screw securing a knife edge. 2. Replace the old knife edge with a new one. 3. Secure the knife edge with the screw. 4. Repeat this procedure for all the knife edges. Leaf arm 1. Remove the knurled knob. 2.
Replacing Spare Parts 2. Tighten the two screws to secure the Teflon slide in place. Clamping force spring 1. Unscrew the knurled knob until it is off the shaft. 2. Replace the old spring with the new one. 3. Screw the knurled knob back on the shaft. High energy spring 1. Remove the screws holding the knife edge assembly. 2. Replace the spring (do not lose the small piston). 3. Install the new spring behind the small piston. 4. Install the knife edge assembly.
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