The design of a cycle safety helmet requires a lining that will crush at a stress of
Question:
The design of a cycle safety helmet requires a lining that will crush at a stress of 8-12 MPa and be as light as possible. Use the \(\sigma_{f}-ho\) chart of Fig. 3.4 to select an appropriate class of material to meet this need.
Fig. 3.4
Transcribed Image Text:
10,000 T Strength-density Metals and polymers: yield strength, a Ceramics, glasses: modulus of rupture, MOR Elastomers: tensile tear strength, 1000 Composites: tensile failure, o Strength, of (MPa) 100 10 0.1 Foams Rigid polymer foams. Ceramics Composites Diamond Si3N4 SIC Al alloys CERP Al2O3 Ti alloys Steels Metals Ni alloys Tungsten alloys Polymers and elastomers Mg alloys, GFRP PEEK Tungsten carbide PMMA -Copper. alloys Woods, Il- Natural materials Flexible polymer foams 0.01 10 100 PP- PE Woods, Zinc alloys Lead alloys Cork Butyl rubber Silicone elastomers Concrete Guidelines for minimum mass design 1000 Density, p (kg/m) 10,000 MFA 15
Fantastic news! We've Found the answer you've been seeking!
Step by Step Answer:
Answer rating: 100% (QA)
Answered By
Utsab mitra
I have the expertise to deliver these subjects to college and higher-level students. The services would involve only solving assignments, homework help, and others.
I have experience in delivering these subjects for the last 6 years on a freelancing basis in different companies around the globe. I am CMA certified and CGMA UK. I have professional experience of 18 years in the industry involved in the manufacturing company and IT implementation experience of over 12 years.
I have delivered this help to students effortlessly, which is essential to give the students a good grade in their studies.
3.50+
2+ Reviews
10+ Question Solved
Related Book For
Question Posted:
Students also viewed these Engineering questions
-
Marlon wants to use the right interest rate to calculate his needs in retirement. If he thinks his investments will continue to get an 8% nominal return and that inflation will slow to 2%, What is...
-
can someone solve this Modern workstations typically have memory systems that incorporate two or three levels of caching. Explain why they are designed like this. [4 marks] In order to investigate...
-
4 Comparative Programming Languages illustrating your answer by explaining the meaning of the following fragment of code: [self isAwake] whileTrue: [| item | item := self askForCookie. (self...
-
In Australia, the banking sector is dominated by four main institutions, the ANZ Banking Group, Commonwealth Bank, National Australia Bank, and Westpac. To maintain a competitive banking market, the...
-
The article "Reliability-Based Service-Life Assessment of Aging Concrete Structures" (J. Structural Engr., 1993: 1600-1621) suggests that a Poisson process can be used to represent the occurrence of...
-
Marvin Johnson is an Environmental Engineer for one of several local plants whose water discharges flow into a lake in a flourishing tourist area. Included in Marvins responsibilities is the...
-
The dataset ToyotaCorolla.jmp contains data on used cars on sale during the late summer of 2004 in the Netherlands. It has 1436 records containing details on 38 attributes, including Price, Age,...
-
Prepare journal entries to record the following retirement. (Show computations and round to the nearest dollar.)The December 31, 2010 balance sheet of Wolfe Co. included the following items: 7.5%...
-
Molly Malone sells shellfish from a cart. She charges $8 for cockles, $10 for mussels, and $20 for oysters. One week she sold the following amounts of each type of shellfish: Monday Tuesday Wednesday...
-
Use the modulus-strength \(E-\sigma_{f}\) chart of Fig. 3.5 to find materials that have \(E>10 \mathrm{GPa}\) and \(\sigma_{f}>1000 \mathrm{MPa}\). Fig. 3.5 1000 Modulus strength Metals and polymers:...
-
Do titanium alloys have a higher or lower specific strength (strength/density, \(\sigma_{f} / ho\) ) than the best steels? This is important when you want strength at low weight (landing gear of...
-
Information that covers methods of managing stress. Write about the methods you have used to reduce your stress. Discuss which methods were helpful to you and which were not helpful in reducing your...
-
1. The following procedure evaluates the function z( x, y) where Z( x, y) = 27*x 14y+ (10*x + 17*y)* (19*x -3*y) procedure Evalz; var x, y, z: integer; begin write 'x? '; read x; write cr, lf, 'y? ';...
-
63. [5 points] As part of the program in Java, use the if-else-if statement to code the following flowchart: assign grade as a single character A when the score is greater than 89; otherwise, assign...
-
1. Write a Python program that declares two lists. a. Set the values in the first list to [-3, 0, 3, 6] by initializing on the line where the list is declared. Print the elements of the list using...
-
(a) Simplify the following summation to produce a closed form. Show your work, clearly stating when you apply each summation identity. ) (b) Convert the following recurrence into a summation by...
-
(a) Show that 6n+nlog(n) (10 log(n)) is true by finding a c and no that satisfy the definition of "dominates" and big-. Please show your work. (b) Show that log3 (n) = 0 (log(n)) by finding a c and...
-
Very large magnetic fields can be produced using a procedure called flux compression. A metallic cylindrical tube of radius R is placed coaxially in a long solenoid of somewhat larger radius. The...
-
The company manufactures three products: wooden chairs, tables and dressers. AFC started off as a 'Mom & Pop' shop but has grown rapidly. AFC uses one assembly line to build all three products,...
-
What is the prediction of the CAPM with respect to the expected return on any security? Why is the variance of a portfolio of internationally diversified stocks likely to be lower than the variance...
-
Given that the rate of change in the exchange rate is conditionally normally distributed, if the standard deviation of the 90-day rate of appreciation of the CAD relative to the USD is 4%, what range...
-
Buck Company purchased a computer and a desk for $ 9 , 0 0 0 cash. An appraiser determined the fair market value of computer to be $ 3 , 0 0 0 and the desk to be $ 7 , 0 0 0 . Based on this...
Study smarter with the SolutionInn App