Specimen edge burrs and non-parallel core surfaces introduce localized crushing artifacts, inflating initial displacement metrics.
Utilize a spherical seat self-aligning upper compression platen paired with direct-on-sample extensometers or LVDTs.
Always use a direct-contact deflectometer setup to measure core deflection; crosshead travel includes platen-seating errors.
Always use a direct-contact deflectometer setup to measure core deflection; crosshead travel includes platen-seating errors.
Direct displacement tracking captures the true elastic deformation slope of delicate cell walls without systemic compliance noise.
Ensure honeycomb core cell axes are aligned perfectly parallel to the loading vector to capture true out-of-plane strength.
Ignoring the initial non-linear toe region of the load curve instead of performing a proper mathematical toe-compensation correction.
Typical testing system controllers rely on 24-bit resolution. Under high-accuracy flexural analysis, this creates a data phenomenon called **”stair-stepping”** or quantization error. When trying to track minor micro-deflection in rigid polymers, 24-bit electronic circuits suffer from resolution limits, dropping critical transition points during initial load curves.
Newton Characterization™ architecture utilizes a 32-bit analog-to-digital processor converter. This increases measurement fidelity by a factor of 256x, outputting 4.29 billion discrete signal thresholds. Electrical chatter is actively muted under a dedicated 100,000:1 Signal-to-Noise Ratio (SNR).
Comparing standard 24-bit quantization with Newton™ 32-bit resolution
Observe the stepped resolution blocks in the legacy 24-bit curve (Red) versus the absolute **analog-smooth response curve** captured by Newton™ 32-bit architectures (Green). This fidelity is what prevents mechanical data variance during modulus evaluation.
Expert Engineering Commentary
Core Problem Identification
Artificial softening on the initial stress-strain slope caused by the compression platens seating against uneven cell walls.
Root Cause Analysis
Minor macro-surface waves across the core sample face creating non-simultaneous contact across the platen area.
Hardware Specific Solutions
Hardened steel compression platens with an integrated sub-press spherical alignment seat and a direct-deflection displacement cage.