MXPA98001422A - System for checking a viscoelast material - Google Patents

Abstract

A system for performing a flexometric test including a balanced beam (16) supporting an anvil (24) in which the viscoelastic material (14) is placed, the balanced beam (16) is balanced on the rotating shaft and can rotate around of the shaft of the rotating shaft, a mong for applying a static load to the material, a hammer (52) opposite the anvil (24) for applying a dynamic thermal stress to the material, and a detector that detects permanent dimensional changes in the material

Description

SYSTEM FOR TESTING A VISCOELASTIC MATERIAL FIELD OF THE INVENTION The invention relates generally to the system and method for testing viscoelastic properties of a material, and more particularly, to a system and method capable of performing tests with a flexometer on a material to determine the elevation of temperature and permanent set and tests to determine certain viscoelastic properties of the material, such as the module of storage and loss of module. BACKGROUND OF THE INVENTION It is often desirable to characterize many properties of a specimen or compound to assist in predicting the compound's response to various applications, to aid in the research and development of compounds and as an aid in the quality control of a manufactured compound. . For example, it is desirable that it be able to predict the rolling resistance that a vehicle tire made of a certain rubber compound will have without actually making it and testing an elaborate tire of this compound. This rolling resistance can be predicted or inferred by certain characteristics of a rubber sample, such as the change in temperature and the permanent setting of a material, when it is subjected to a flexometer test.

One type of flexometer, the Goodrich type flexometer, is written in Method A of the ASTM Designation: D 623, entitled Standard Test Methods for the Properties of Rubber - Heat Generation and Fatigue to Flexion in Compression. "Such a flexometer is relatively inexpensive and small, but provides only limited information regarding the characteristics of the material, such as temperature change and permanent setting.Other devices are available, which are able to determine the fundamental viscoelastic properties of a specimen, but are often In addition, many of these machines do not perform the flexometric test, it will be desirable to provide a system for performing flexometric tests as well as other tests to determine the fundamental viscoelastic properties of a material that are relatively inexpensive, small and simple to operate. The invention provides a system and method for performing flexometric tests as well as other tests for the determination of viscoelastic properties of a material. The device is easily converted from a configuration for performing flexometric tests to one to perform tests to determine the fundamental viscoelastic properties by locking a balanced beam member in place and informing a processor that the test will be performed. According to one aspect of the invention, a device for testing various properties of a viscoelastic material includes a balanced beam that supports an anvil in which the material is placed, the balanced beam has a fixed state and a moveable state, an assembly of load to apply a static load to the material, when said balance is in a movable state and that induces an initial static stress in said material when said balanced beam is in a fixed state, a hammer opposite the anvil for the application of a dynamic force in the material, a first detector that detects the dynamic stress applied to the material by the hammer when the balanced beam is in the fixed state, a load cell that detects the response of the force of the material by the load of the initial static stress and the effort dynamic when the balanced beam is in the fixed state, and a second detector that detects the permanent dimensional changes in the material which the balanced beam is in the movable state. According to another aspect of the invention, a device for testing various properties of a viscoelastic material includes a balanced beam that supports an anvil in which the material is placed, the balanced beam has a fixed state and a movable state, a load assembly for the application of a static load to the material when said balanced beam is in a movable state and which induces an initial static stress in said material when said balanced beam is in a fixed state, a hammer opposite the anvil for the application of a dynamic effort to the material, a first detector that detects the dynamic stress applied to the material by the hammer when the balanced beam is in a fixed state, a load cell that detects the response of the force of the material by the initial static stress and the dynamic stress when the balanced beam is in a fixed state, and a thermoelectric pile that detects the temperature of the material when the balanced beam is in the mobile state. According to another aspect of the invention a method for testing various properties of the viscoelastic material includes the step to select between a first test and a second test to be performed, applying a static load to the material when said second test is selected and which induces to an initial static stress in said material when said first test is selected, to apply a dynamic stress to the material, to detect the dynamic stress applied to the material when the first test is selected, to detect the response of the force of the material by the initial static stress and the dynamic effort when the first test is selected, and detect the permanent dimensional changes in the material when the second test is selected. According to another aspect of the invention, a method for testing various properties of a viscoelastic material that includes the steps of selecting between a first test and a second test to be performed, applying a static load to the material when said second test is selected. and that induces an initial static stress in said material when said first test is selected, to apply a dynamic stress to the material, to detect the dynamic stress applied to the material when the first test is selected, to detect the response of the force of the material by the load of the initial static stress and dynamic stress when the first test is selected, and detect the temperature of the material when the second test is selected. According to a further aspect of the invention, a system for performing a flexometric test including a balanced beam supporting an anvil in which the viscoelastic material is placed, the balanced beam is swung by a pivotable and pivotable arrow around the arrow rotatable, a mounting to apply a static load to the material, a hammer opposite the anvil to apply a dynamic stress to the material and a detector that detects the permanent dimensional changes in the material. According to a further aspect of the invention, a system for performing a viscoelastic test that includes a balanced beam supporting an anvil in which the viscoelastic material is placed, the balanced beam swings in a rotatable arrow and is selectively pivotable about a rotatable shaft of the shaft, a locking assembly includes a first contact for contacting the lower part of said balanced beam and a second contact for bringing the upper part of said balance beam into contact, the locking assembly having a first state where the beam is free to rotate on an axis and the second state where the contact coactuates to lock the balance beam in a fixed position, a mount to apply a static force to the material, a hammer opposite the anvil to apply a dynamic effort to the material, at least one detector to detect the response of the material by the test, and a controller to control the state of the material work stoppage In accordance still with a further aspect of the invention, a mounting for the conversion of a flexometer having a fulcrum or fulcrum with a blade edge including a rotatable arrow rotatably secured in a mounting apparatus, the mounting device is mounted on the flexometer frame in substitution of the point of support with blade edge and in substitution of the pivot block adapted for the replacement of a pivot block in a balanced beam of a flexometer, the replacement of the block The pivot is further adapted to receive at least a portion of the arrow where the pivot axis of the arrow and the balance beam are coaxial with the point of support or fulcrum with blade edge prior to replacement. The above features as well as other features of the invention will be fully described hereinafter and the accompanying drawings represent certain detailed illustrative embodiments of the invention, these are indicative, however, are few of the various ways in which they can be employ the principles of the invention. It will be appreciated that the scope of the invention will be determined by the claims and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS In the attached Figures: Figure 1 is a partial isometric view of a test system according to the present invention; Figure 2 is a partial side view of the test system of Figure 1; Figure 3 is a graphical record of the temperature as a function of the operating time in minutes by a flexometric test; and Figure 4 is a superimposed representation of a stress applied to a test specimen and the waveform of the force response of the specimen to the applied stress as a function of time; Figure 5 is an enlarged view of the pivot assembly of a flexometer conversion having a fulcrum or fulcrum with blade edge; Figure 6 is an enlarged view of an alternate pivot assembly; Figure 7 is a view of a locking assembly viewed downwardly of the balanced beam; Figure 8 is a partial side view of an automatic locking assembly of Figure 7 with the support bearings removed for clarity issues and the beam balanced in a fixed state; and Figure 9 is a partial side view of an automatic locking assembly of Figure 7 with the support bearings removed for clarity issues and the beam balanced in a free state. DETAILED DESCRIPTION OF THE INVENTION With reference to the drawings and initially to Figure 1, a test system 10 according to an embodiment of the present invention is shown. The test system 10 is preferably operable in at least two modes, such as in a mode for performing a flexometric test and a way to perform a test to determine certain fundamental viscoelastic properties of the test material, for example, the storage module, loss module and tan delta. The test system 10 includes a frame 11, a test device 12 in which the test specimen 14 is placed, an oven (not shown) surrounding the test specimen and a portion of the test device, a beam balanced with high inertia 16 balanced at the point of support or fulcrum 18, a drive system 20 and a computer or processor 22. Computer 22 controls various aspects of the test, and / or collects the test data, and / or computes the properties of the test specimen 14 of the test data collected according to the test that has been selected for the operation. The computer can be any of a number of processing units and related components capable of interacting with remote devices, capable of obtaining and digitizing the data and capable of computing the data described below.

The lower portion of the test device 12 includes an anvil 24, on which the test specimen 14 rests, connected to the balanced beam 16 through the load cell 26, the position arrow 28, and a leveling system 30. shown in Figure 2. The leveling system 30 includes a pair of magnetic proximity sensors 32 connected to the computer 22 by means of the lines 33 which in combination allow the computer to determine if the balanced beam 16 is level, a motor leveling 34, a drive gear 36 in the network with the appropriate gears in the position arrow 28, and a drive shaft 38 connecting the leveling motor and the drive gear. The rotation of the drive shaft 38 by the leveling motor 34 thus causes the drive gear 36 to rotate. The rotation of the drive gear 36 is translated in a vertical movement of the position arrow 28 and an anvil 24 through the cooperation of the drive gear gears and the gears in the position arrow. A manual leveling crankshaft 39 is also provided which is engaged with the drive shaft 38 to raise or lower the anvil 24 in the same manner as is achieved by the leveling motor 34. At either end of the balanced beam 16 is suspended a weight of inertia 40, 41 which in combination add inertia to the balanced beam, so that it is not substantially realized by perceiving the anvil 24 the relatively high frequency waveform during the flexometric test. The load weight 42 can be placed above the rear inertial weight 40 thus causing the static force to be translated through the balanced beam 16, the position arrow 28, the load cell 26 and anvil 24 to act the specimen of test 14. Preferably, the connections between the rods that suspend the weights and the balanced beam 16 are designed to reduce the movement of the weights during the test. When the test system 10 is subjected to a flexometric test, as described in more detail below, most of the test specimens 14 are likely to undergo a small permanent reduction in their weight during the test. This phenomenon is known as "permanent setting". A change in the permanent setting of the test specimen 14 will cause the leading end 44 of the balanced beam 16 tends to lean slightly towards the test specimen 14 by virtue of the static load applied by the load weight 42. Any inclination of the Balanced beam 16 is detected by proximity sensors 32 and reported to computer 22 which will command the leveling motor 34 via line 46 to rotate in the appropriate direction to raise or lower the position arrow 28 and the anvil 24 in relation to the balanced beam. Since the test specimen 14 prevents movement of the anvil 24, the balanced beam 16 will adjust its position and thus be maintained during the flexometric test. A displacement transducer 48, such as a linear variable differential transformer (LVDT) detects any position change in the position arrow 28 and the anvil 24 in relation to the balanced beam 16. Any of the position changes detected by the transducer Displacement 48 is collected by the computer 22 via the connection 50 between the displacement transducer and the computer and stored by the computer as changes in the permanent setting of the test specimen 14. A displacement transducer, such as an LVDT also it can be used in place of the pair of magnetic proximity sensors 32. The upper portion of the test device 12 includes a hammer 52, as seen in Figure 1, placed above the anvil 24 and abutting the upper part of the specimen of test 14 and the drive frame 54. The drive frame 54 includes an upper transverse member 56 connected to the hammer it 52 by the rod 58, a lower transverse member 60 and a pair of vertical posts 62 extending between the upper and lower transverse members. The posts 62 are mounted in a sliding and vertical manner to the frame 11, thus restricting the vertical movement of the hammer 52 with the drive frame 5. The lower transverse member 60 of the drive frame 54 is connected to a tie rod 64 mounted eccentrically in the drive system 20 through the adjustable disk 66. The rotation of the drive system 20 thus causes a vertical cyclic path of the tie rod 64. , the drive frame 54 and the hammer 52, the amplitude of which is determined by the degree of eccentricity of the connection between the tie rod and the drive system. The degree of eccentricity and thereby the width of the stroke of the hammer is adjustable through the adjusting bolt 68. To perform the flexometric test with the test system 10, an operator will place a test specimen 14 of the viscoelastic material that will to be tested between the anvil 24 and the hammer 52. The operator then adds the appropriate load weight 42 to the rear inertia weight 40, the levels of the balanced beam 16 employed by the leveling crankshaft 39, establishes the desired stroke of the hammer 52 through adjustment pin 68, and informs computer 22 that the flexometric test has been performed. Some variables of the test, such as furnace temperature, hammer stroke frequency and test duration can be set by entering the variables within the computer 22 or manually adjusting when the computer does not establish control of the variables test. When the test is started, the hammer 52 will go through a vertical cycle, thereby exerting a dynamic stress on the test sample 14, while the sample is subjected concurrently to the static load of the load weight 42. A thermoelectric cell 70 (see Figure 2) mounted preferably on the upper part of the anvil 24 and placed below the test sample 14 detects the temperature of the test sample throughout the test and transfers the detected temperature as an electrical signal to the computer 22 on line 72 to be stored as a function of time. Any adjustment made to the level of the balanced beam 16 during the test in response to changes in the permanent setting of the test sample 14 is detected by the displacement transducer 48 and transferred to the computer 22 on the line 50. Once the flexometric test is completed, typically after approximately 25 minutes, the operator can enter the command to the computer to print the results or to represent or print a graphic representation of the desired test results, such as a representation of the temperature and of the permanent setting for the test sample 14 as a function of time as shown in Figure 3. When it is desired to perform a different test, such as a dynamic mechanical test to determine certain fundamental viscoelastic properties of a test specimen, the system Test 10 is quickly reconfigured to change the test capabilities. To perform a dynamic mechanical test (DMT), the operator slides the needle 74 shown in the Figure 1 for coupling the balanced beam 16. When the needle 74 is slidably mounted to the frame 11, the balanced beam is then supported at two points, the fulcrum or fulcrum 18 and the needle 74 and thereby fixed during the proof. Since the balanced beam 16 is fixed, any desired initial static stress in the specimen 14 can be reduced by rotating the leveling crankshaft 39 (Figure 2). The operator then sets the path of the desired hammer 52 through the adjusting bolt 68, and informs the computer 22 that the dynamic mechanical test has been performed. Some test variables, such as furnace temperature, hammer travel frequency, and test duration can be set by entering the variables into computer 22 or manually adjusting when the computer does not establish control of the variables test. When the test is started, the hammer 52 will go through a vertical cycle, thus exerting a dynamic stress on the test sample 14, while the sample is subjected concurrently to the static load by the adjustment in the height of the anvil 24. During the In the test, the computer 22 will sample the output of the signal by the load cell 26 on the line 76 to develop a waveform of the force response of the test material 14 in the applied dynamic stress for a time. When the drive system 20 rotates and drives the drive frame 54 and the hammer 52 through its path, the position of the drive frame and thereby the position of the hammer is detected by the position transducer 78 (see FIG. 1) connected between the frame 11 and an extension arm 80 of the drive frame 54. The position transducer 78 can be a linear variable differential transformer or a similar device that develops an electrical signal as a function of the linear position and transfers the signal to the computer 22 on the line 82. During the test, the result of the position transducer 78 on the line 82 the computer 22 performs sampling, which develops a form of dynamic stress applied to the test specimen by correlating the submitted data to sampling over time. Figure 4 illustrates the waveform 84 of the applied stress exerted by the hammer 52 on the test sample 14 and the force response 86 of the test sample for an exemplary test. In conclusion of the test, the computer 22 will calculate the change or difference of the phase between the two waveforms using an appropriate technique, such as a Fast Fourier Transform algorithm. The complex module (E *) of the test sample can be calculated and reduced in the storage module (E ') and the loss module (E ") as well as in tan delta (E" / E') for Test sample through known methods. The balanced beam 16 of a standard flexometer typically has a pivot mount 88 where the balanced beam 16 is balanced at the point of support or fulcrum with blade edge 18 as shown in Figure 5. The blade edge portion of the The fulcrum or fulcrum 18 typically has approximately one vertex 90 of 60 degrees and is generally fitted within a 90 degree notch 92 provided in the pivot block 94 secured to a recess 96 in the lower part of the balanced beam 16. Pivot block 94 is typically secured to the balanced beam 16, through a number of bolts or bolts 98 and is made of a material resistant to chafing or abrasion of the blade edge. While the fulcrum point or fulcrum with blade edge 18 and notch 92 provides, at least initially, relatively low friction and a precise pivot shaft to the balanced beam 16, the blade edge may wear or chip during a weather, especially during certain high stress tests, such as the blow test where a specimen is tested under a heavy load until it fails. An alternate embodiment of the pivot assembly 100 is shown in Figure 6. The pivot assembly 100 includes an arrow 102 steerably rotatable on either side of the beam 16 by the journals 104. The journals 104 are mounted in turn on the frame 11 of test system 10. Bearings 104 may be conventional ball bearing assemblies with seals, guards and a viscous grease preferably removed to reduce the friction of the rotating shaft within the journal. The arrow 102 passes through a housing passage 106 in a pivot block 108 sized to fit within the recess 96 in the lower portion of the balanced beam 16 and secured to the balanced beam, such as by mounting screws 98. Preferably , the passageway 106 extending through the pivot block 108 is generally in the form of a truncated cylinder displaced in the direction of the balance beam 16 to form a rectangular opening 110 in the surface 112 of the pivot block which is in confrontation with the surface 114 of the recess 96 in the balanced beam. The arrow 102 preferably has a flat surface 116 formed on the upper surface thereof of the approximate size of the rectangular opening 110 centrally located between the journals 104. The flat surface 116 of the arrow 102 is in confrontation with the surface 11 and in FIG. contact with it, of the recess 96 which prevents the rotation of the arrow in relation to the balanced beam 16 and thus confining the beam balanced with the pivot around the central axis of the arrow. When the flat surface 116 of the arrow 102 has a length approximately equal to the width of the balanced beam 16, the surfaces 118 of the arrow extend perpendicular to the flat surface 116, which corresponds to the full diameter of the arrow, in comparison with the sides 120 of the balanced beam and avoids the relative axial movement between the balanced beam and the arrow. Through the use of the pivot assembly 100, the balanced beam 16 rotates about its relatively free axis but is secured in relation to the frame 11, thus preventing the balanced beam 16 from bouncing off the pivot shaft even under extreme test conditions. This reduces wear on the pivot mount 100 and promotes more accurate testing over a longer period of life. The pivot assembly 100 may also be used as a replacement equipment to modify many existing fluxes that include the knife edge pivot assembly 88 as shown in Figure 5. In such a case, the pivot block 108 (FIG. 6) is dimensioned to fit within the existing recess 96 in the balanced beam 16 and is adapted to be mounted on the balanced beam in the same way as the pivot block 94 was mounted, by means of screw 98. Preferably, the axis of rotation 122 of the arrow 102 is placed on the pivot shaft 124 of fulcrum or fulcrum with blade edge 18 and thus the balanced beam maintains the same pivot point after the pivot assembly 88 is replaced by the pivot assembly 100. When the pivot block 108 and the arrow are positioned at the pivot point of the pivot assembly 100, the aggregate components do not effectively add an inertial weight to the balanced beam or an appreciable yield effect. of the flexometer. To replace an existing pivot assembly 88 by the pivot assembly 100, the fulcrum or fulcrum point with knife edge 18 and the pivot block 94 of the pivot assembly 88 are removed and replaced by the journal bearings 104 pivot 108 and arrow 102. Preferably other modifications are not necessary in the flexometer. With reference to Figures 7 to 9, an automatic locking assembly 130 is shown to lock to the balanced beam 16 in place during the entire test or part thereof. The automatic locking assembly 130 performs the same function as the manual locking pin 74 shown in Figure 1 and is used to lock the balanced beam in place in a level condition during the non-flexometric tests as well as in the start and end of the flexometric test. Locking assembly 130 is preferably positioned just behind the pivot assembly 100 between the pivot assembly and leveling detectors 32. Locking assembly 130 includes an upper and a lower eccentric cam 132 and 134, respectively, with the upper cam 132 which is placed above the balanced beam 16 for a selective contact with the upper surface 136 of the beam and with the lower cam 134 which is placed below the balanced beam for a selective contact with the surface lower 138 of the beam. The cams 132 and 134 are rotatable between at least two positions and coact with the pivot assembly 100 to lock the balanced beam 16 in a level position when it is in a rotational position and allow the balanced beam to rotate about the axis of rotation. pivot 122 when in a second rotation position. Each cam 132, 134 is held in place in relation to the balanced beam 16 and rotates through a connection with the arrow 140, 142, respectively, secured within the bearing assemblies 144 and 146 arranged on either side of the beam balanced The rotational movement of the upper arrow 140, in which the upper cam 132 is secured, is achieved through the lever arm 148 and an actuator 150. The actuator 150 can be one of several known types, which includes a hydraulic or pneumatic cylinder, and is secured to the frame 11 through a suitable connection 152 that allows angular movement of the actuator in relation to the frame. The rod 154 of the actuator is rotatably connected to the lever arm 148 which is fixed to the upper arrow 140 and extends radially away from it. The lever arm 148 thus moves the linear movement of the rod 154 within a rotational movement of the upper arrow 140 and the upper cam 132. Located on the upper arrow 140 remote from the lever arm 148 is an upper gear 156 which rotates with the top arrow. The upper gear 156 is interlocked with the similar lower gear 158 fixed to the lower shaft 142. Accordingly, the rotation of the upper shaft 140 and the upper gear 156 via the drive device 150 communicates with the lower shaft 142 and the gear lower 158 so that the cams rotate together. The degree of eccentricity of the cams is such that a small travel of the driving rod 154 causes the cams to selectively engage the balanced beam 16 and to be secured in a locked level position or sufficiently retracted from the balanced beam, in the that the beam can rotate on the axis in an unblocked manner to the extent necessary to perform the flexometric test. The drive device 150 and consequently the cams 132, 134 are preferably controlled by a processor, such as the computer 22 on the line 160 according to the specific test to be performed. For example, before the initiation of the flexometric test, the computer 22 will control the actuator 150 to completely retract the drive rod 154 thereby causing the upper and lower cams 132 and 134 to rotate in a position that is in contact respectively with the upper and lower surfaces 136 and 138, of the balanced beam 16 and locking the beam in a level condition, as shown in Figures 7 and 8. After the test has begun and the response of the beam has been established. the machine in varying efforts, the computer 22 will then cause the drive device 150 to extend to the drive rod 154 and the cams to rotate away from the balanced beam 16 to allow them to rotate on the shaft in a free condition for the remainder of the test, as shown in Figure 9. At the end of the flexometric test time or the detection by the computer of another condition, such as When the response of the material in the test has suddenly changed, the computer 22 will cause the actuator 150 to retract the actuator rod 154 thereby rotating the cams 132 and 134 in contact with the balanced beam 16 to lock it in the fixed state. The test can be stopped without significant risk of damaging the balanced beam 16 or the pivot assembly 100 when the system decreases upon stopping. The automatic locking assembly 150 thus allows the test, just as a flexometric test is performed without assistance. When the operator instructs the test system 10 to perform a test that requires a fixed beam, such as a test of certain fundamental viscoelastic properties, the computer 22 will control the drive device 150 to completely retract the rod of the drive device 154, caused so that the upper and lower cams 132 and 134 rotate in a position in contact with the upper and lower surfaces 136 and 138 respectively, of the balanced beam and lock to the beam in a level, fixed condition through the test.

Claims (17)

1. NOVELTY OF THE INVENTION Having described the invention as above it is considered of our property that contained in the following: CLAIMS 1. A system for performing flexometric tests, comprising: a balanced beam that supports an anvil in which the viscoelastic material is placed, The balanced beam is pivotable, a mounting for applying a static load to the material, a hammer opposite the anvil to apply a dynamic stress to the material, and a detector that detects the permanent dimensional changes in the material, characterized in that the balanced beam is balanced in a pivotable and pivotable arrow around the axis of the rotatable arrow. The system of claim 1, including a locking assembly including a first contact to contact the lower part of the balanced beam and a second contact to contact the upper part of the balanced beam, the Lock assembly has a first state, where the beam is free to rotate on its axis and a second state where the contacts coact to lock the beam in a fixed position. 3. A system for performing a viscoelastic test, comprising: a balanced beam supporting an anvil in which the viscoelastic material is placed, the balanced beam is rotatable, a mounting to apply a static force to the material, a hammer opposite the anvil to apply a dynamic stress to the material, and at least one detector that detects the response of the material in the test, characterized in that the balanced beam is balanced on the rotatable shaft and is selectively pivotable about the axis of the rotatable shaft, a locked that includes a first contact to contact the lower part of the balanced beam and a second contact to contact the upper part of the balanced beam, the locking assembly has a first state where the beam is free of rotate on its axis, and a second state where contacts coact to lock the balanced beam in a fixed position, and a controller for Control the state of the lock assembly. The system of any of claims 1 to 3, wherein the arrow is rotatably fixed within a pair of support bearings. The system of any of claims 1 to 4, wherein the arrow includes a flat area in contact with the lower part of the balanced beam. The system of any of claims 1 to 5, wherein the arrow is fixed to the beam balanced through the pivot block. The system of any of claims 1 to 6, which includes a thermoelectric pilo that senses the temperature of the material. The system of any of claims 2 to 7, which includes a controller for controlling the state of the lock assembly. The system of claim 8, wherein the controller controls the latch assembly for it in the second state at the beginning and end of the flexometric test and is in the first state during an intermediate part of the flexometric test. The system of claim 8, wherein the controller controls the lock assembly that is in the second state through the test. The system of any of claims 2 to 10, wherein the contacts are eccentric cams. The system of claim 11, wherein the cams are fixed to the rotatable arrows rotating by a drive device and a link of the lever arm. The system of any of claims 1 to 12, which includes a processor for controlling the test, and / or the collected test data, and / or the computing properties of the material. The system of claim 13, wherein said processor determines the phase difference between the waveform of the applied dynamic stress and the waveform of the force response of the material. 15. The system of claim 14, wherein said processor calculates certain fundamental viscoelastic properties of the material of said phase difference, the waveform of the applied dynamic stress and the waveform of the response of the force of the material. 16. A mounting for the conversion of a flexometer having a fulcrum or fulcrum with blade edge supporting a balanced beam, characterized in that a rotatable arrow is rotatably fixed in a mounting apparatus, the mounting apparatus is mounted on the Flexometer frame in substitution of the fulcrum with a blade edge, and a substitution pivot block adapted to replace a pivot block in a balanced beam of a flexometer, the substitution pivot block is further adapted to receive at less a portion of the arrow where the pivot axis of the arrow and the balanced beam are coaxial with the point of support or fulcrum with blade edge before replacement. The assembly of claim 16, wherein the arrow includes a flat area in contact with the bottom of the balanced beam.