What does notched Izod mean?
Notched Izod Impact is a single point test that measures a materials resistance to impact from a swinging pendulum. Izod impact is defined as the kinetic energy needed to initiate fracture and continue the fracture until the specimen is broken.
What is the impact strength of HDPE?
HDPE (HIGH DENSITY POLYETHYLENE)
| Physical | Astm Test Method | HDPE |
|---|---|---|
| Flexural Strength (PSI) | D790 | – |
| Flexural Modulus (PSI) | D790 | 200,000 |
| Izod Impact (Notched), ft-lb/in | D256 | 3 |
| Shore D Hardness | D785 | D70 |
How is plastic toughness calculated?
Toughness of a plastic is measured by its resistance to impacts. It is the ability of a material to resist both fracture and deformation. One common way to discuss the toughness of a polymer is to examine the area underneath the stress – strain curve for the particular polymer.
What is the hardness of HDPE?
Differences Between HDPE and LPDE
| UNITS | HDPE | |
|---|---|---|
| Hardness Rockwell M&R, Durometer Shore D (73°F) | scale as noted | Shore D 69 |
| Izod impact (notched, 73°F) | ft-lbs/in | – |
| Coefficient of linear thermal expansion | in/in/°Fx10-5 | 7.0 |
| Heat deflection temperature @ 66 psi/264 psi | °F | 172 |
Why notch is provided in Izod impact test?
The notch in impact testing serves as a stress concentration zone, so that the resistance to shock to impact load can be calculated accurately. The notch serves as a stress concentration zone and some materials are more sensitive towards notches than others. The notch depth and tip radius are therefore very important.
Why do we use notch in impact test?
Why do we use notch in impact test? Impact energy is a measure of the work done to fracture a test specimen. When the striker impacts the specimen, the specimen will absorb energy until it yields. The test specimen continues to absorb energy and work hardens at the plastic zone at the notch.
Is HDPE impact resistant?
HDPE is a durable, versatile thermoplastic that offers fantastic impact resistance and tensile strength. HDPE is also resistant to chemicals, corrosion, absorption, and abrasion. However, HDPE can only support low-to-moderate heat resistance. HDPE is a relatively low-cost material and easy to fabricate.
What is the tensile strength of HDPE?
| Physical Properties | Metric | English |
|---|---|---|
| Hardness, Shore D | 50.0 – 76.0 | 50.0 – 76.0 |
| Ball Indentation Hardness | 35.0 – 58.0 MPa | 5080 – 8410 psi |
| Tensile Strength, Ultimate | 7.60 – 43.0 MPa | 1100 – 6240 psi |
| Film Tensile Strength at Yield, MD | 21.0 – 35.0 MPa | 3050 – 5080 psi |
What is the difference between HDPE and LDPE pipes?
LDPE is softer and more flexible than HDPE. HDPE is rigid and durable and offers greater chemical resistance. Its higher melting point (135° C) allows it to withstand higher temperatures than LDPE. Its more crystalline structure also results in greater strength and opacity of the material.
What is LDPE pipe?
LDPE pipe is used to supply water to low-volume irrigation systems such as micro drip, micro-spray, micro-sprinkler or dripline.
What does Notched Izod stand for?
Izod Impact Testing (Notched Izod) ASTM D256, ISO 180 is a common test to understand notch sensitivity in plastics. Scope: Notched Izod Impact is a single point test that measures a materials resistance to impact from a swinging pendulum. Izod impact is defined as the kinetic energy needed to initiate fracture and continue the fracture until
How to measure Notched Izod impact (Izod impact)?
Tests results, especially in Europe, may be reported as energy lost per unit cross-sectional area at the notch (J/m2 or ft-lb/in2). Test methods used to measure Notched Izod Impact (Or notch sensitivity) in plastics are ASTM D256 and ISO 180.
Why is my specimen notched for impact testing?
Izod specimens are notched to prevent deformation of the specimen upon impact. This test can be used as a quick and easy quality control check to determine if a material meets specific impact properties or to compare materials for general toughness.
What does the Izod test measure?
As discussed above, it measures the energy to be applied to a notched standardized sample to break it. The result of the Izod test is reported in energy lost during the impact per unit of specimen thickness (such as ft-lb/in or J/cm) at the notch.