IZOD + CHARPY IMPACT LAB
Standards-aware impact energy calculator and process analysis (for reference only, not a validated tool)
Built for ASTM E23, ISO 148-1, ASTM D256, ASTM D6110, ISO 180, and ISO 179-1 workflows. Enter 1 to 100 tests, generate a datasheet, check distribution/normality, evaluate process capability, and compare two brands with a t-test.
Input Meaning
These entries are enough to estimate absorbed impact energy from pendulum motion. For strict standards reporting, additional specimen and setup fields are often required.
Initial pendulum height (m)
Height of the pendulum center of mass above the bottom of swing before release. This represents initial potential energy.
Final pendulum height (m)
Height reached after impact. The difference between initial and final height is the energy absorbed by the specimen plus system losses.
Pendulum mass (kg)
Effective pendulum mass used by your tester. Use your calibrated machine value.
Pendulum length (m)
Distance from pivot to center of mass. Used to verify geometric consistency and estimate swing angles from heights.
Cross-sectional area at notch (mm2, optional)
For plastics standards and specific energy reporting (kJ/m2), this area is typically required.
Test Datasheet Input (1 to 100 Tests)
Enter each specimen result. This table supports single to high-volume test sets and feeds the six-pack analysis charts automatically.
Compliance fields are optional and can be shown when needed.
Drop CSV here to populate input rows
Or use the template andto import.
| Sample ID | Material | Standard | Initial h (m) | Final h (m) | Mass (kg) | Length (m) | Area (mm2) | Notes | Action |
|---|---|---|---|---|---|---|---|---|---|
Calculated Results
Absorbed energy uses potential energy difference: E = m * g * (h_initial - h_final). Specific value is reported as J/mm2 when area is entered.
| Sample | Standard | Absorbed Energy (J) | Specific (J/mm2) | Initial Angle (deg) | Final Angle (deg) |
|---|---|---|---|---|---|
| S-1 | ASTM E23 | 114.130 | 1.426622 | 86.42 | 43.64 |
| S-2 | ASTM E23 | 114.777 | 1.434713 | 86.42 | 43.32 |
| S-3 | ASTM E23 | 115.209 | 1.440107 | 86.42 | 43.11 |
| S-4 | ASTM E23 | 115.640 | 1.445500 | 86.42 | 42.90 |
| S-5 | ASTM E23 | 116.072 | 1.450894 | 86.42 | 42.69 |
| S-6 | ASTM E23 | 116.503 | 1.456288 | 86.42 | 42.48 |
| S-7 | ASTM E23 | 116.719 | 1.458984 | 86.42 | 42.37 |
| S-8 | ASTM E23 | 116.934 | 1.461681 | 86.42 | 42.27 |
| S-9 | ASTM E23 | 117.150 | 1.464378 | 86.42 | 42.16 |
| S-10 | ASTM E23 | 117.366 | 1.467075 | 86.42 | 42.06 |
| S-11 | ASTM E23 | 117.797 | 1.472468 | 86.42 | 41.84 |
| S-12 | ASTM E23 | 118.229 | 1.477862 | 86.42 | 41.63 |
| S-13 | ASTM E23 | 118.660 | 1.483256 | 86.42 | 41.41 |
| S-14 | ASTM E23 | 119.092 | 1.488649 | 86.42 | 41.19 |
| S-15 | ASTM E23 | 119.739 | 1.496740 | 86.42 | 40.87 |
Standards Input Check: ASTM E23
This checker highlights whether your entered fields cover the energy calculation inputs and which additional fields are commonly required for report-level compliance.
Core Inputs for Energy
- Initial pendulum heightProvided
Vertical distance from pendulum center of mass to the lowest swing point before impact.
- Final pendulum heightProvided
Vertical distance reached after specimen fracture or deformation.
- Pendulum massProvided
Effective impacting mass of pendulum (including striker assembly if required by your machine calibration).
- Pendulum lengthProvided
Distance from pivot to pendulum center of mass used to infer angle consistency.
Common Compliance Inputs
- Specimen dimensions + notch detailsNot in current form
Required for full ASTM E23 reporting and energy normalization where applicable.
- Test temperatureNot in current form
Mandatory when test conditions include non-ambient control.
- Machine verification/calibration statusNot in current form
Verification of impact machine condition is part of standards compliance.
Note: This app estimates absorbed energy from pendulum heights. For audited compliance, verify machine-specific correction factors and full reporting clauses in the selected standard.
Specification Limits for Capability
Enter optional limits in Joules to compute Cp/Cpk and process capability visuals.
Six-Pack Analysis
1) Individual Value Plot
2) Moving Range Plot
3) Histogram
4) Normal Probability Plot
5) Capability Snapshot
6) Process Summary
Min
114.130
Q1
115.640
Median
116.934
Q3
117.797
Max
119.739
Normality p (approx)
0.6850
Cp
2.484
Cpk
2.290
Normality check: passes at alpha 0.05 (approximate Jarque-Bera p-value).
Capability: Add LSL/USL targets for meaningful Cp/Cpk interpretation.
Saved data: Use CSV export in the datasheet section for downstream archive.
Two-Brand Comparison (T-test)
Compare absorbed energy distributions between two sample types. Enter one value per line or comma-separated values. Target workflow: 15 samples vs 15 samples.
Mean A (J)
116.800
Mean B (J)
114.287
p-value (approx.)
0.0000
Welch t / df
t = 9.494 | df = 26.14
Interpretation
Statistically different at alpha=0.05
Statistical note: p-values use a normal approximation of the t distribution for fast screening. For regulated decisions, confirm with validated statistical software.