Category: Mechanical Engineering

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Mechanical Engineering Important Questions and Answers Notes

Need Mechanical Engineering exam notes containing important theory questions, answers, derivations, and frequently asked university problems.

Each group will produce a focused mini-review paper on one approved corrosion-related topic. The project must synthesize real research papers, identify knowledge gaps, and propose future work that is relevant to engineering corrosion, materials science, chemistry, or physics. The emphasis is on computational, theoretical, modeling, mechanistic, or literature-based work and not experimental. Databases to use: Google Scholar and ScienceDirect.

My payload should be around 15 kgs and I have to design the drone from scratch and around the payload please help me. Requesting tutors to give me a step by step guide. Additionally, Given that I am a College student Please stick to the budget given as I can afford that much?

I know how much payload ill be carrying, with the help of that i want to know how to package it and get the best fuselage shape. If possible can you please give me a step by step guide?

Assignment Execution Instructions Stress Analysis (MECH0018.1)

Student Name: Usama Mohamed Said Al Jahwari

You are required to complete the full lab portfolio assignment using ANSYS Mechanical APDL R1 2026. The work must be accurate, complete, and professionally presented, including all required simulation files.

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## General Requirements

– Use ANSYS Mechanical APDL 2026 R1 only

– Provide step-by-step modeling with clear screenshots

– All results must be explained and justified

– Submit a complete Word report

– Include all ANSYS software files

– Use consistent units (mm, N, MPa)

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## Task 1: Stress Concentration Analysis

### Student Data:

– A = 90 mm

– B = 70 mm

– C = 50 mm

– D = 40 mm

– E = 50 mm

– F = 25 mm

### Model Setup:

– Plate with hole (as per assignment figure)

– Load = 70 kN (tensile)

– Thickness = 15 mm

– Material:

– E = 210 10 N/mm

– = 0.29

– Element Type: PLANE183

– Plane stress with thickness

### Required Work:

A. Define and explain PLANE183 element

B. Compute deformation:

– With hole

– Without hole

Provide comparison with figures

C. Mesh Sensitivity Analysis:

– Coarse mesh

– Medium mesh

– Fine mesh

Select optimum mesh and justify

D. Determine maximum stress at:

– Section 1

– Section 2

– Section 3

E. Calculate Stress Concentration Factor (Kt)

F. Thickness Study:

Repeat analysis for:

– 20 mm

– 25 mm

– 30 mm

Compare results

G. Fillet Analysis:

Add fillet and compare stress with and without fillet

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## Task 2: Buckling Analysis

### Student Data:

– L1 = 118 mm

– L2 = 92 mm

– Force = 13 kN

– I-Beam = W530 66

– Number of Modes = 5

### Model Setup:

– Element Type: BEAM188

– Material:

– EX = 210e6

– PRXY = 0.27

– Density = 7.8e-9

– Number of elements per line = 30

### Required Work:

– Perform buckling analysis

– Extract 5 modes

### Results:

For each mode:

– Deformation at points a, b, c

– In directions X, Y, Z

– Fill the required table completely

—

## Task 3: Fracture Mechanics Analysis

### Student Data:

– Crack length (a) = 0.016 m

– Plate width (b) = 0.17 m

– Applied stress = 105 MPa

### Model Setup:

– Material:

– E = 180 GPa

– = 0.3

– Use PLANE183 and quarter-point crack-tip elements (PLANE82)

### Required Work:

A. Stress Intensity Factor (SIF)

1. Analytical solution

2. ANSYS solution

3. Compare results

4. Calculate percentage error

B. Crack Length Study

Increase crack length three times:

– 0.026 m

– 0.036 m

– 0.046 m

Provide table and discussion

C. Stress vs SIF

– Use stress values from 120 MPa to 240 MPa (increment 20 MPa)

– Plot SIF vs stress

– Determine maximum allowable stress using KIC = 23

– Repeat for semi-circular crack

—

## Required ANSYS Files

You must submit all software files:

For each task:

– .db

– .rst

– .log

– .inp or APDL command files

– Any macros used

Folder structure:

– Task1_Usama

– Task2_Usama

– Task3_Usama

—

## Report Structure

The report must include:

1. Title Page

2. Table of Contents

3. Introduction

4. Methodology with screenshots

5. Results (tables and figures)

6. Discussion

7. Conclusion

8. References (APA style)

—

## Important Notes

– All work must be original

– No copy-paste

– Every step must be documented

– Results must be logically explained

—

## Final Deliverables

1. Complete Word report

2. All ANSYS APDL files

3. Screenshots of modeling steps and results

4. Graphs and tables

—

Complete all tasks with high accuracy and professional presentation.

Hello,

Please solve the problems in the attached file of (lab 8)

I also attached the relevant lecture for your reference (lecture 8)

The intake and exhaust systems act as the “lungs” of the engine, managing the flow of gases to support combustion:

Intake System: Its role is to deliver a precise amount of clean air (and sometimes fuel) to the cylinders. Engineers design intake manifolds with specific lengths and shapes to utilize Helmholtz resonance, which uses pressure waves to “push” more air into the chamber at certain engine speeds.

Exhaust System: This system expels post-combustion gases while minimizing backpressure. It also serves to reduce noise (via mufflers) and toxic emissions (via catalytic converters).

The Limiting Factor: The primary constraint is Volumetric Efficiency (eta_v). This is the ratio of the actual mass of air trapped in the cylinder to the theoretical mass that could fit in the cylinder volume at atmospheric pressure.

In high-performance engineering, tools like turbochargers or superchargers are used to artificially increase intake pressure, pushing eta_v beyond 100% to maximize power.

Hello,

Please solve the homework in the attached file.

Kindly show the solving steps and not only the final answer.

solve using matlab or excel, and computer written only

no hand written