The final exam includes a guaranteed question asking you to apply the Processing → Structure → Properties → Performance framework to a biomedical material. Practice below. Select a device, write your own answer in each box, then reveal the model answer.
⚙️ Processing
→
🔬 Structure
→
📏 Properties
→
🏥 Performance
💡 Exam tip: You don't need to describe every interaction — focus on the primary chain for your chosen device. The exam says "it would be great if you use your team project" but any device you know well is fine. Aim for 2-3 sentences per node, with specific material names, mechanisms, and clinical consequences.
📐 Open Note — Stress-Strain Calculation Practice
The final exam open note section includes a stress-strain calculation problem very similar to Exam 2. The data are given as a load-displacement table for a flat dog-bone specimen. Click each question to reveal the worked answer. New this exam: you will be asked for specimen length in the elastic AND plastic region.
Key Formulas
Area
A₀ = w × t
width × thickness (mm²)
Eng. Stress
σ = F / A₀
N/mm² = MPa
Eng. Strain
ε = ΔL / L₀
dimensionless (or %)
Young's Modulus
E = σ / ε
use elastic data points only
Ductility
%EL = (ΔL_f/L₀)×100
strain at fracture × 100
Resilience
Uᵣ = σ²_YS / (2E)
J/m³ — use consistent SI units
⭐ Elastic Length Recovery
ΔL_elastic = (σ/E) × L₀
If F < F_YS → L_final = L₀ (full recovery). If F > F_YS → L_final = L_loaded − ΔL_elastic (permanent set remains)
Practice Specimen — Co-28Cr-6Mo Alloy Dog-Bone
Gage Width = 8 mm | Gage Thickness = 4 mm | Gage Length L₀ = 80 mm
Load (N)
Displacement (mm)
Notes
0
0.000
6,400
0.080
12,800
0.160
16,000
0.200
Onset of permanent deformation
18,000
1.000
24,000
4.800
28,800 (max)
9.600
Maximum load — necking begins
26,000
14.400
Fracture
Worked Questions — click to reveal
🔑 The key new concept: When a force in the elastic region is removed, the specimen returns exactly to L₀ — all deformation recovers. When a force in the plastic region is removed, only the elastic portion recovers (ΔL_elastic = σ/E × L₀). The plastic displacement — read directly from the data table — is permanent. This is the core difference being tested in parts (g) and (h).
BME 240 Study Guide
Pick a preset (Midterm 1, Midterm 2, or Final), or manually select topics, then choose a study mode.
🃏 Flashcards
Flip cards to review terms & answers. Mark Know It / Still Learning and filter your deck.
⚡ Quiz
Timed Kahoot-style MC — colored tiles, countdown bar, streak bonus, and confetti.
🔗 Matching
Click a term, then its definition. Clear all pairs to advance to the next set.
✓✗ True / False
Fast-fire T/F with streak counter and answer explanations.
✍ Explain It
Short-answer practice. Write your explanation, reveal the model answer, then self-rate. Best prep for conceptual exam questions.
📝 Fill in Blank
Key sentences with blanks — type the missing term and check your answer. Great for vocabulary and definitions.
🔢 Ordering
Arrange steps into the correct sequence using ▲▼ buttons. Tests processes like wound healing, coagulation, polymerization, and FDA pathways.
📽 Class Mode
Full-screen projector view. Shows question + colored tiles (answers hidden). Click Show Answer to reveal. Use ← → keys or buttons to navigate. Press Space to reveal, Esc to exit.