Kuwait University
COLLEGE OF ENGINEERING & PETROLEUM

TESTING MODES

Figure 1: UTM INSTRON MODEL 5581 ALONG WITH ENVIRONMENTAL CONTROL CHAMBER 3119-407

COMPRESSION TEST:
The specimen is uniaxially compressed and load and deformation are recorded. Compressive stress and strain are calculated and plotted as a stress-strain diagram which is used to determine elastic limit, yield point, yield strength in compression.

TENSILE TEST:
Tensile testing provides most information about the mechanical behavior of materials. In this test the material is deformed uniaxially as the load is applied. The load and displacement are recorded using load cell and extensometer respectively. The tensile test result is commonly presented as stress-strain curve as shown in the figure. 

FLEXURE TEST:
Flexure test method measures the behavior of materials subjected to simple beam loading. Maximum stress and maximum strain are calculated for increments of load. Results are plotted in a stress-strain diagram. Flexural strength is defined as the maximum stress in the outermost fiber. In addition, flexural modulus is calculated from the slope of the stress vs. deflection curve if the curve has no linear region.

Univeresal Testing Machine

 Instron Model 5581

CAPABILITIES:

  • The current UTM is commonly used for static testing in tensile or compression, tensile creep and relaxation (for polymers). Depending upon the test set up additional tests can be performed like shear, flexure, creep, peel, tear, cyclic and bend tests.
  • Several mechanical properties can be measured such as elastic modulus, yield strength, tensile strength and ductility etc using the different testing modes.
  • These properties can be measured at room temperature at an elevated temperature as well as at sub-ambient temperature.
  • To measure these properties at an elevated temperature we use Environmental Control Chamber which extends its temperature range up to 350 Deg centigrade.
  • To measure these properties at sub-ambient temperature we use liquid nitrogen in the environmental control chamber. It enables us to measure these properties up to temperature range -150 deg centigrade

Instron-5581 is a 50 KN load capacity floor mounting type electro-mechanical testing system. A load transducer (load cell) mounted in series with the specimen, measures the applied load. The load cell converts the load into electrical signals that the control system measures and displays. Using the Extensometer during the test provides the more accurate direct measurement and closed-loop control of specimen displacement. It has a high accuracy and wide frequency response and can be used with metals, rigid thermoplastics and thermosetting plastics exhibiting total strain up to ±100% of the original gauge length. The current UTM is commonly used for static testing in tensile or compression, tensile creep and relaxation (for polymers). Depending upon the test set up additional tests can be performed like shear, flexure, creep, peel, tear, cyclic and bend tests. Picture of the UTM along with the environmental control chamber is shown on the next page.

Specification:

  • Load capacity: 50 KN
  • Maximum Speed & Minimum speed: 1000/0.001 mm/min
  • Maximum Force at Full Speed: 35 KN
  • Maximum Speed at Full load: 500 mm/min
  • Return Speed: 1000 mm/min
  • Position Control Resolution: 0.100 µm
  • Total Cross Head Travel Space: 1235 mm
  • Total Vertical Test Space: 1309 mm
  • Space Between Columns: 575 mm
  • Frame Dimensions: 209 cm (H) x 130 cm (W) x 76 cm (D)


Software:
Bluehill2 software controls Instron testing system for test setup, test

control, data collection, result generation and report preparation. The

software features a graphical user interface, which provides up to four

real time numerical displays (digital and/ analog) of test data as well as

graphs, results table and reports.