{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

EMA4223 HW 9 Solutions

# EMA4223 HW 9 Solutions - 9.1 A Charpy machine with a hammer...

This preview shows pages 1–6. Sign up to view the full content.

9.1 A Charpy machine with a hammer weighing 200N has a 1-m long arm. The initial height h o is equal to 1.2m. The Charpy specimen, (See Figure 9.2), absorbs 80J of energy in the fracturing process. Determine: (a) The velocity of the hammer upon impact with the specimen. (b) The velocity of the hammer after breaking the specimen. (c) An average strain rate in the specimen (d) The final height attained by the specimen From part (b)

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
9.6 A thermoplastic polymer has a plane-strain fracture toughness K Ic =15MPa m 1/2 and a yield strength σ y = 80MPa. Estimate the requirements for dimensions of a fracture toughness specimen for this sample.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Which means that 9.11 Norton NC-132 hot pressed Si 3 N 4 has the following tensile strengths for the given tests: Three-point bending: 930 MPa Four-point bending: 720 MPa Uniaxial tension: 550 MPa Larger measured failure stresses mean smaller flaw sizes were seen in the sample, therefore the largest flaws were seen in the uniaxial tension test while smaller flaws led to

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern