Localized skin crushing under the loading anvils induces premature failure, masking true core shear propagation limits.
Incorporate thick rubber or elastomer padding strips between the loading anvils and the sandwich panel skin faces.
Always place the specified elastomer pads between the anvils and the panel to spread out high localized line loads.
Always place the specified elastomer pads between the anvils and the panel to spread out high localized line loads.
Distributing the contact load prevents premature localized face skin indentation, ensuring the core reaches its ultimate shear design limit.
Select a short span intentionally if your goal is core shear characterization, as long spans will favor skin tensile failure.
Using a standard long-span bend setup that forces skin tension failure while misapplying the core shear equations to the data.
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
Localized puncture or dimpling of the thin facing material directly beneath the central loading anvil before core shear occurs.
Root Cause Analysis
High localized contact stress concentrations pushing into thin composite facings from rigid steel loading rollers.
Hardware Specific Solutions
Heavy-duty flexure base with broad adjustable support anvils, integrated rubber pad kits, and a central mid-span deflectometer.