filmov
tv
The Definitive Guide to Three Point Bend Testing of Plastic to ASTM D790 & ISO 178
Показать описание
Learn more about ASTM D790
Learn more about ISO 178
This video shows how three different Instron systems and accessories are configured to perform the test according to the standards.
ASTM D790 is very similar to ISO 178, though it differs in several key points:
1. ISO 178 requires the use of either a deflectometer or compliance correction in order to determine modulus. In ASTM D790 this is only a recommendation, and modulus can be calculated by crosshead displacement alone.
2. Preferred specimen sizes are different, and because test speed is dependent on specimen depth, test speeds between the standards may vary. The preferred depth of ASTM D790 specimens is 3.2 mm. The preferred depth for ISO 178 specimens is 4 mm.
3. ASTM D790 allows only one test speed, whereas ISO 1780 allows a second (faster) test speed to be used after modulus is measured.
ASTM D790 and ISO 178 measures the flexural properties of a material while under a bending strain or deflection and determines the following mechanical properties:
• Tangent modulus- Also known as flexural modulus, this is the slope of the initial linear portion of the load deflection curve and is a measurement of the material's stiffness
• Secant modulus- The slope between the origin and a predefined point on the load deflection curve
• Chord modulus- The slope between two predefined points on the load deflection curve
• Flexural strength- The maximum flexural stress obtained during a bend test
• Flexural Stress at Break- The flexural stress at which a specimen breaks during a bend test. For some materials, the specimen breaks before a yield point, in which cases the flexural strength equals the flexural stress at break.
Subscribe to our Newsletter
Learn more about ISO 178
This video shows how three different Instron systems and accessories are configured to perform the test according to the standards.
ASTM D790 is very similar to ISO 178, though it differs in several key points:
1. ISO 178 requires the use of either a deflectometer or compliance correction in order to determine modulus. In ASTM D790 this is only a recommendation, and modulus can be calculated by crosshead displacement alone.
2. Preferred specimen sizes are different, and because test speed is dependent on specimen depth, test speeds between the standards may vary. The preferred depth of ASTM D790 specimens is 3.2 mm. The preferred depth for ISO 178 specimens is 4 mm.
3. ASTM D790 allows only one test speed, whereas ISO 1780 allows a second (faster) test speed to be used after modulus is measured.
ASTM D790 and ISO 178 measures the flexural properties of a material while under a bending strain or deflection and determines the following mechanical properties:
• Tangent modulus- Also known as flexural modulus, this is the slope of the initial linear portion of the load deflection curve and is a measurement of the material's stiffness
• Secant modulus- The slope between the origin and a predefined point on the load deflection curve
• Chord modulus- The slope between two predefined points on the load deflection curve
• Flexural strength- The maximum flexural stress obtained during a bend test
• Flexural Stress at Break- The flexural stress at which a specimen breaks during a bend test. For some materials, the specimen breaks before a yield point, in which cases the flexural strength equals the flexural stress at break.
Subscribe to our Newsletter
0:02:27
The Definitive Guide to Three Point Bend Testing of Plastic to ASTM D790 & ISO 178
4:32:29
Ultimate Guide to Three Body Problem
0:00:12
The Ultimate Guide to Tyre Throw Competitions #shorts
0:08:22
The DEFINITIVE Guide to Mega Man X3 (All Items, Least Backtracking)
0:24:35
POLAND Had Enough of RUSSIA - Prepares for WAR
1:28:59
Reverse: 1999 - COMPLETE GUIDE 'The Three Doors' All Stage
1:27:09
Reverse: 1999 | COMPLETE GUIDE | THE THREE DOORS 'Beneath The Ashes' All Stage
0:01:26
React Three Fiber: The Ultimate Guide to 3D Web Development
0:26:50
The Complete Guide to Mesh Analysis | Engineering Circuit Analysis | (Solved Examples)
0:14:38
The Ultimate Guide to Combat Power Enhancement in Peak of the Three Kingdoms 2
1:19:56
Reverse: 1999 | COMPLETE GUIDE | THE THREE DOORS 'History of the Gears' All Stage
0:08:51
$20 vs $200 Travel Clothes: the Ultimate Guide
0:07:44
🔴 #3 Get Started with Three.js: A Beginner's Guide to Installing and Creating Your First Projec...
0:15:40
The Ultimate Guide to Leveling in Peak of the Three Kingdoms 2
0:11:06
The Complete Guide to Power-Leveling in Peak of the Three Kingdoms 2
0:00:18
The 'Three-Character Classic,' a timeless guide
0:02:17
Ultimate Guide to Tarot Card Meanings: Three of Swords
0:00:43
Three Different Laundry Hand Washing Methods | A Drycleaner’s Guide
0:20:30
The Ultimate Guide to the Binding of Isaac: Path to Dead God
0:01:01
Mastering the Three-Part Breath: A Guide by Bernie Clark
1:17:18
The Definitive Guide to Improving
0:00:45
Zuniga on 3 Jewelry Rules You Should Know
1:43:29
The Definitive Guide to Microsoft Excel for Real Estate by A.CRE (Updated for 2022)
6:31:57
Three.js 101 Crash Course: Beginner’s Guide to 3D Web Design (7 HOURS!)
Комментарии