Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Mechanical Engineering Expert

Introduction

The objective of Part I is to propose a feasible design of a microscale device (“microdevice”) that allows tensile tests to be performed on specimens only several hundred nanometers in diameter (“nanowires”). The basics of this design are provided to you. These basics are conceptually the same as those that have been used in research laboratories to perform tensile tests on nickel nanowires1,2. Those laboratories have performed detailed, in-­-depth design calculations of a more complicated microdevice (Figure A) using more advanced topics than are covered in ME 305; however, use of more introductory topics can still lead to a firm understanding of this microdevice’s design. This project focuses only on the design of a simplified version of the microdevice, shown in Figure B.

780_Microdevice.jpg

Description of the Simplified Microdevice

• The microdevice is designed to be mounted beneath a nanoindenter and to convert the downward movement of the nanoindenter tip into 2-­-D movement of the sample-­-stage shuttle. The movement of the two halves of the sample-­-stage shuttle in opposite, horizontal directions effects uniaxial tensile loading of a horizontally oriented specimen mounted across the gap of the sample-­-stage shuttle.

• The microdevice is made entirely of single-­-crystal silicon: E = 160 GPa; ν = 0.278; σfracture = 7000 MPa when no flaws are present; σfracture = 210 MPa when flaws are present. Silicon is a linear-­-elastic, brittle material.

• For the purposes of this course project, the specifics of the top shuttle (Figure A) are not of concern. You are to assume that, effectively, the top ends of the two inclined beams are loaded directly, each by a force P equal to one half of the force applied by the nanoindenter tip (Figure B). Moreover, you are to assume that P is a translating “follower load”, meaning that P is always acting downward on the top end of the beam, no matter how that end translates as a result of beam deflection, beam deformation, sample-­-stage translation, etc.

• The thickness of the sample-­-stage shuttle can be considered large enough so that any deflection and deformation of this element can be considered negligible. Note that the sample-­-stage shuttle and inclined beams are fabricated as a single unit, so there are no pin joints or otherwise moveable joints connecting the inclined beams to the sample-­-stage shuttle. The rollers and guides are assumed to be rigid and frictionless.

Design Tasks

The focus of your design considerations is on the two inclined beams that connect the sample stage to the top stage and base. The beams are square in cross-­-section. Your team is to propose a thickness (t), length (l), and incline angle (θ ) of these beams that permit the following conditions:

- A tensile displacement of up to 800 nm, at a resolution of 1 nm, can be applied to the sample.
- A tensile force of up to 0.1 mN, at resolution of 70 nN, can be applied to the sample.
- The micro device can be operated with a nanoindenter that has a force resolution of 70 nN, a displacement resolution of 0.8675 nm, a maximum allowable force of 1mN, and a maximum allowable displacement of 5000 nm.

Deliverables

One concise and complete report is required for each team (2 people/team). The report must consist of the following sections:

a) Cover Page: Include your name, course number (ME305), section (A1), and date.

b) Introduction: This section should summarize the objective and your overall approach.

c) Methods: This section should include an organized and logical description of your design process and the methods by which you determined if a candidate design met the objectives.

d) Results: This section should include a set of figures that presents your final design and the results of calculations that demonstrate, in theory, that your design meets all components of the objective.

e) References: This section should include a list of any references consulted when working on this project. for bibliographic reference material, full citations should be provided.

f) Appendix: This section must include final versions of any computer code written for this project. In addition, include any other material that you think is directly relevant to presenting your design process and results. The combined length of the Introduction, Methods, and Results should be no more than seven double-­-space pages (12-­-pt font, 1” margins), inclusive of all figures and tables.

Mechanical Engineering, Engineering

  • Category:- Mechanical Engineering
  • Reference No.:- M91058

Have any Question? 


Related Questions in Mechanical Engineering

Experiment title heat engine experimentacademic in charge

Experiment title: Heat Engine Experiment Academic in charge of experiment: Experiment duration: The standard scheduled time for this experiment is 90 minutes for 3 groups (A, B, C) of 6 students. Each group undertakes ex ...

1 if we had only a ruler and a clock as measuring devices

1. If we had only a ruler and a clock as measuring devices, how could we measure the density of water? 2. Calculate the height in meters of a column of water that exerts a pressure of 1.00 bar at its base.

How is that process-that curve-modified if this is a sheet

How is that process-that curve-modified if this is a sheet metal joint? Do variations in friction between male and female threads affect the torque-turn relationship? Describe the turn-of-nut procedure used in structural ...

1 estimate the viscosity of nitrogen at 175 k using given

1. Estimate the viscosity of nitrogen at 175 K using given equation. 2. Calculate the viscosity of oxygen at 350°K and compare with the value given in Appendix I. 3. What is the percentage change in the viscosity of wate ...

Sea water rho 1025 kgm3 flows through a pump at 021 m3s

Sea water, ρ = 1025 kg/m 3 , flows through a pump at 0:21 m 3 /s. The pump inlet is 0.25 m in diameter. At the inlet the pressure is -0.15 m of mercury. The pump outlet, 0.152 m in diameter, is 1.8 m above the inlet. The ...

At the end of a water pipe of 3-in diameter is a nozzle

At the end of a water pipe of 3-in. diameter is a nozzle that discharges a jet having a diameter of 1½ in. into the open atmosphere. The pressure in the pipe is 60 psig (pounds per square inch gage), and the rate of disc ...

There are 3 x 103 spheres in a box calculate the number of

There are 3 x 10 3 spheres in a box. Calculate the number of different combinations for the spheres in order to have 1100 spheres in the front third of the box. Assuming that the distribution is normal, calculate the pro ...

How would you identify the best nut factor for your

How would you identify the best nut factor for your application? How much torque would be required to tighten an ASTM A193 Gr. B16 bolt with a 31/4-8 thread to 60% of yield? Why does a wrench create a side load on the bo ...

The fugacity and fugacity coefficient are determined as a

The fugacity and fugacity coefficient are determined as a function of pressure and temperature for a model gas. These variables can be varied using sliders. The student is asked to determine the Boyle temperature and als ...

As an expert in computer security you have been approached

As an expert in computer security, you have been approached by an organization that campaigns for the rights of torture victims and have been asked to help the organization gain unauthorized access to the computer system ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro

Describe what you learned about the impact of economic

Describe what you learned about the impact of economic, social, and demographic trends affecting the US labor environmen