ame514_assignment_pt09_final-2

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PT09 AME514

M.S RAMAIAH SCHOOL OF ADVANCED STUDIES

Postgraduate Engineering and Management Programme [PEMP]

Department: Automotive Design and Engineering

Course: Automotive Engineering

Module Code: AME514

Module Title: Structural Fatigue and Reliability Analysis

Module Leader: Chidambar D. Kulkarni and Dr. Vinod K. Banthia

Assignment

1. This assignment has three parts

2. The weightage of the three parts are – Part A (20), Part B (40) and Part C (40)

3. The assignment should be word processed confirming to the format prescribed in the template

provided by the ARO

4. The length of the assignment report should be limited to 35 pages in your writing

5. The assignment should be submitted to the ARO’s office on or before 09-Oct-10

6. Finite element software ANSYS and Fe-Safe should be used for the simulation basedproblems

7. All the units of measurement wherever applicable should be SI Units only

8. Method of evaluation

9. Whether group work is permitted and method of evaluation under such circumstances.

10. IMPORTANT: It essential that all the sources used in preparation of the assignment must be

suitably referenced in the text.



PT09 AME514

06 Marks

iv. Find, using Fe-safe, fatigue life and critical site for crack initiation for connecting rod.

Fatigue loading coming on the connecting rod is shown in figure 1. (b). Comment on the

fatigue life predicted by the analysis. If fatigue life is infinite, discuss how the design canbe improved, if fatigue life is finite explain which parameters in design can be adjusted to

make the fatigue life infinite.

(06+05+03) Marks

PART-C:

A machine component which is in the form of a wide thin plate, subjected to uniform stress

(σ), contains a circular hole of diameter D (Figure 2). Consider the plate as very wide

compared to any crack that may be present in it.

(a) If there is a small crack of length,

(03+03) Marks ii) Develop a finite elem

0 Marks

iii) Plot curves of crack length ve

04 Marks

iv) Explain relevance of assignment to the learning outcomes

i)

‘a’, growing from the surface of the

hole, as shown in Figure 2, what would

be a suitable approximate expression for

the geometric stress intensity factor?

Clearly explain the applicability of the

expression. (b) If the crack in part (i.a)becomes long (compared to the zone of

influence of the notch), what would be a

suitable approximate expression for the

geometric stress intensity factor?

Clearly explain the suitability of the

expression and the difference between

this and the expressions considered inpart (i.a).

ent model to

obtain stress intensity factor for the plate

with a hole and a crack and compare the

simulation and analytical results for

crack lengths of 1.0 mm to 7.0 mm in

steps of 2.0 mm.2

rsus stress

intensity factor and discuss.



PT09 AME514

its.

for possible

• should be critically reviewed and discussed.

Marking Scheme

Section Description Marks

• All the graphs should have appropriate axis notations with proper un

• All the analysis work done using software should be saved

demonstration.

Results obtained

A(i) Arguments 08

A(ii) Organisation 07

A(iii) Language, presentation and referencing 05

Total (Part A) 20

B(i) Types of loading, critical locations and loads 04+03

B(ii) Finite element modelling, BC application, solution and discussion 03+05+05

B(iii) Discussion up-to 300 words, understanding, language, presentation 06

B(iv) Fatigue life, and discuss the results 06+ 0305+

Total (Part B) 40

C(i) Suitable approximate expression for the geom nsity 0etric stress inte

factor in both conditions, and difference between them

3+03

C(ii) odelling, Grid 20Selection of suitable elements and Finite Element Mindependence study, Application of suitable boundary conditions and

justification for the same, Determination of stress intensity factor for

different values of crack length

C(iii) ack length versus stress intensity 04Plot and discuss curves of cr

factor C(iv) nts on Learning Outcomes and Formatting 10Comme

Total (Part C) 40

Total 100



PT09 AME514

Form – 43 Ver: 2 Date: 01-08-20095

ame514_assignment_pt09_final-2

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