strain gauge rosette

Strain gauge rosettes from Kingmach are designed to measure biaxial stress states with known or unknown principal directions. We provide three standard configurations: the tee rosette (0°-90°), the rectangular rosette (0°-45°-90°), and the delta rosette (0°-60°-120°), each with its own advantages. Tee rosettes are often used when principal axes are aligned with the gauge axes, while rectangular and delta types let you compute the full stress tensor when directions aren’t known in advance. We typically supply gauges with nominal resistances of 120Ω or 350Ω, as these are well-suited for most measurement circuits, but can adjust to spec. For geotechnical environments—think concrete embedment, rock bolts, or steel liners—long-term stability is non‑negotiable. That’s why our rosettes come with options for temperature compensation matched to common structural materials like steel (11.7 ppm/°C), aluminum (23 ppm/°C), or quartz‑like low‑expansion materials. If your project exposes the gauges to moisture or chemical attack, we can encapsulate them in polyurethane or other protective coatings. Because we manufacture in‑house, we also handle customizations like extended lead wires, different lead arrangements (flat, twisted), or pre‑attached connectors to speed up field setup. Selecting the right rosette means picking the correct grid length. For homogeneous materials with uniform stress fields, longer grids (e.g., 6 mm) average out surface roughness; for high stress gradients near notches or cracks, shorter grids (e.g., 1.5 mm) give you more localized data. Our application engineers can review your strain field expectations and recommend a balance without over‑engineering. Beyond the gauge itself, we stock adhesives, coatings, and wiring accessories, and we offer installation training—on‑site or remote—to make sure your rosette works in the dirt and grime where you need it. With a global distribution network and responsive tech support, Kingmach can turn around standard orders quickly and discuss custom lead times upfront. Reach out with your measurement challenge; we’ll help you nail down the specifics.